{"id":"cb_question_bank:66b2a315-253e-45e7-b1b3-62e0a2222ca9","source_id":"cb_question_bank","source_item_id":"66b2a315-253e-45e7-b1b3-62e0a2222ca9","external_id":null,"ibn":"00615-DC","question_id":"55bb437a","program":"SAT","module":"math","domain_code":"S","domain":"Geometry and Trigonometry","skill_code":"S.C.","skill":"Right triangles and trigonometry","difficulty":"H","score_band":7,"answer_type":"spr","answer_source":"rationale","layout_warning":null,"form_id":null,"module_number":null,"position":null,"stem":"In the figure above, tangent of B equals the fraction 3 over 4 . If B C equals 15 and D A, equals 4 , what is the length of line segment D E ?","stimulus":"The figure presents right triangle A, B C, with horizontal side A, C. Point B is directly above point A and angle A is a right angle. Point D lies on side A, B and point E lies on side B C. Horizontal line segment D E is drawn and angle D is a right angle.","stimulus_html":"<div class=\"stimulus_reference \">\n        <div class=\"standalone_image \">\n          <img src=\"/api/assets/16829e055e75a5c3c941dfc20f63d8bdeef2e000899572adab39c06c5c883bb4\" alt=\"The figure presents right triangle A, B C, with horizontal side A, C. Point B is directly above point A and angle A is a right angle. Point D lies on side A, B and point E lies on side B C. Horizontal line segment D E is drawn and angle D is a right angle.\" width=\"96\" height=\"124\"></div>\n      </div>\n","stem_html":"<p class=\"stem_paragraph \">In the figure above,&nbsp;<span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/ef034c159869598ba744f8e708deeda749079b7ddb484d3ffdbf623b003ec89c\" alt=\"tangent of B equals the fraction 3 over 4\"></span><span class=\"math_expression \"></span>. If <span class=\"math_expression \"><span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/fed173572ba0c87964c48a828e550e6674f1bb452a346e34f45dc7183bb1d0dc\" alt=\"B C equals 15\"></span></span> and <span class=\"math_expression \"><span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/17e45b22f505bacc98778384597f629db044c83498622f89f36383443bd6af38\" alt=\"D A, equals 4\"></span></span>, what is the length of <span class=\"math_expression \"><span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/a52774021adb8f06dd866b688c6a0dd3fada4d7dff553049a2b2030c4632a27b\" alt=\"line segment D E\"></span></span> ?</p>\n","rationale_html":"<p>The correct answer is 6. Since <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/ef034c159869598ba744f8e708deeda749079b7ddb484d3ffdbf623b003ec89c\" alt=\"tangent of B equals three fourths\"></span>, <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/efbabe114a79ea6490dc681531bee3e4a00ee732706513be011eec1af2a6d6b1\" alt=\"triangle A, B C\"></span> and <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/82e642c659eaf7028e018202c8c39166d07a603e430ca53db1ddde50c8626788\" alt=\"triangle D B E\"></span> are both similar to 3-4-5 triangles. This means that they are both similar to the right triangle with sides of lengths 3, 4, and 5. Since <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/fed173572ba0c87964c48a828e550e6674f1bb452a346e34f45dc7183bb1d0dc\" alt=\"the length of side B C equals 15\"></span>, which is 3 times as long as the hypotenuse of the 3-4-5 triangle, the similarity ratio of <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/efbabe114a79ea6490dc681531bee3e4a00ee732706513be011eec1af2a6d6b1\" alt=\"triangle A, B C \"></span> to the 3-4-5 triangle is 3:1. Therefore, the length of <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/838c37eb26f8e7bea94de28d37cede03fda6bc1cb7121288f537103ca3516078\" alt=\"side A, C\"></span> (the side opposite to <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/61b5aea476e1a4a9eb9a344dcea029412b2c6b02594967449308b2569b839140\" alt=\"angle B\"></span>) is <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/71ec088f6ffe09281c21ca5677108ee4bc1202418b06bcee5d44b818da01fbf8\" alt=\"3 times 3, equals 9\"></span>, and the length of <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/bc38232964225d3fa314e7d0470d11422beea36b6598d546923dc085e690921c\" alt=\"side A, B\"></span> (the side adjacent to <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/61b5aea476e1a4a9eb9a344dcea029412b2c6b02594967449308b2569b839140\" alt=\"angle B\"></span>) is <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/01511ee26d98cdbe89717f3408c26b3bce28b0e59bb23a99c37f390bce404131\" alt=\"4 times 3, equals 12\"></span>. It is also given that <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/17e45b22f505bacc98778384597f629db044c83498622f89f36383443bd6af38\" alt=\"the length of side D A, equals 4\"></span>. Since <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/5ce2edb37e57f458735dd02f653aa322af944540fdbda487d43cd2df722e81f7\" alt=\"the length of side A, B equals, the length of side D A, plus the length of side D B\"></span> and <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/8cdaa5541871503279b1213014cf727b2dc8b4db391c08b5d0e933503060d2c2\" alt=\"the length of side A, B equals 12\"></span>, it follows that <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/b11dfb6bb8baeedec8c32cd9888237129918cf351852418ca920660d1505013a\" alt=\"the length of side D B equals 8\"></span>, which means that the similarity ratio of <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/82e642c659eaf7028e018202c8c39166d07a603e430ca53db1ddde50c8626788\" alt=\"triangle D B E\"></span> to the 3-4-5 triangle is 2:1 ( <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/e0dc90f5f714cbc78f3b1f3fc6b2df03e53610b983c88a10907c4416bc6894ee\" alt=\"side D B\"></span> is the side adjacent to <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/61b5aea476e1a4a9eb9a344dcea029412b2c6b02594967449308b2569b839140\" alt=\"angle B\"></span>). Therefore, the length of <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/a52774021adb8f06dd866b688c6a0dd3fada4d7dff553049a2b2030c4632a27b\" alt=\"side D E\"></span>, which is the side opposite to <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/61b5aea476e1a4a9eb9a344dcea029412b2c6b02594967449308b2569b839140\" alt=\"angle B\"></span>, is <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/67fb4990bd471f55876945c15952238aa622d83b9a7b527564062aaa806a080f\" alt=\"3 times 2, equals 6\"></span>.</p>\n","correct_answer":["6"],"has_media":true,"has_mathml":false,"has_table":false,"source_created_at":"2023-08-02T20:25:59.614000+00:00","source_updated_at":"2023-08-02T20:25:59.614000+00:00","options":[],"attribution":{"source_id":"cb_question_bank","source_name":"College Board digital SAT question bank (community dump)","rights_holder":"College Board","canonical_url":"https://satsuitequestionbank.collegeboard.org/","retrieved_from":"https://raw.githubusercontent.com/mdn522/sat-question-bank/main/data/cb-digital-questions.json","attribution":"SAT practice questions © College Board, from the official SAT Suite Question Bank. Retrieved via the community dump at github.com/mdn522/sat-question-bank.","disclaimer":"SAT® and PSAT/NMSQT® are trademarks registered by the College Board, which is not affiliated with, does not sponsor, and does not endorse this project.","license":"College Board copyright; source repository carries no licence. Local use only.","redistributable":false,"item_count":2017}}