In triangle ABC, angle C is 90 degrees, AC = B, Cos A = 5/7 Find AB.
August 29, 2021 | education|
ABC – right triangle;
Angle C = 90 degrees;
AC = 5;
cos A = 5/7;
In order to find the hypotenuse AB of the triangle ABC, we use the formula:
cos A = AC / AB.
Hence, AB = AC / cos a;
Substitute the known values into the formula and find the hypotenuse AB.
AB = 5 / (5/7) = 5/1 * 7/5 = 1/1 * 7/1 = 7/1 = 7;
Answer: AB = 7.
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