Question

How don’t know how to do this i don’t if I sit it up right

Answer 1

Given:-

A triangle with side length 3 and 12.

To find the value of angle A.

So the formula used is,

`CosA=\frac{Adjacent\text{ side}}{Hypotneus}`

Substituting the values. we get,

`\begin{gathered} CosA=(3)/(12) \\ A=cos^(-1)((1)/(4)) \\ A=75.52 \end{gathered}`

So the value of A is 75.52 degree.