emilywongg emilywongg

02-08-2016
Mathematics

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The lengths of the sides of a triangle are 5, 12, and 13. What is the measure of the angle opposite to the side with length equal to 13?

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02-08-2016

Hello,

Since 5²+12²=13² (25+144=169), the triangle is rectangular and 13 is the length of the hypotenuse which opposed angle is a right angle:
answer 90°

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