# In triangle ABC, the angle is C-straight, cosA = 0.6, BC = 12. Find AB?

September 29, 2021 | education

| Given:

ABC – right triangle;

Angle C = 90 degrees;

BC = 12;

cos A = 0.6;

Find AB.

Solution:

In order to find the hypotenuse AB of the triangle ABC, we use the formula:

cos A = AC / AB.

Substitute the known values into the formula and find the hypotenuse AB.

0.6 = AC / AB;

6/10 = AC / AB;

3/5 = AC / AB;

Hence, AB = 5.

Answer: AB = 5.

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