Question

Based on the diagram, what is cos A?

Enter your answer in the boxes.

COS A=

Answer 1

$cos(A) = \frac{ {b}^{2} + {c}^{2} - {a}^{2} }{2bc}$

Answer 2

The cos A will be b/c

Cosine function

Cosine function in a triangle is the ratio of the adjacent side to that of the hypotenuse

How to solve this problem?

The steps are as follow:

• Given,

AB = c

BC = a

AC = b

• AB is hypotenous whereas AC is adjacent side to A
• According to formula of cos,

Cos A = Adjacent side to A / Hypoteneous

Cos A = AC / AB

Cos A = b / c

Therefore the value of Cos A in given figure will be b / c

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