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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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  1. 6 July, 20:00
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    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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