Question

Can you please help me I’m confused how to turn my answer cos B = 13/43

Answer 1

Given:

$\begin{gathered} a=13\text{ cm} \\ \\ c=43\text{ cm} \end{gathered}$

Find-:

The angle of B.

Sol:

The angle of B is:

$\begin{gathered} \text{ Base =}a=13\text{ cm} \\ \\ \text{ Hypotenuse =}c=43\text{ cm} \end{gathered}$

Angle "B"

$\cos\theta=\frac{\text{ Base}}{\text{ Hypotenuse }}$$\begin{gathered} \cos B=\frac{\text{ Base}}{\text{ Hypotenuse }} \\ \\ \cos B=\frac{13}{45} \end{gathered}$

So the angle "B" is:

$\begin{gathered} \cos B=\frac{13}{45} \\ \\ B=\cos^{-1}(\frac{13}{45}) \\ \\ B=73.21 \\ \\ B\approx73 \end{gathered}$

The angle of "B" is 73