Question

Does anyone know how to do this I quite don’t understand?

Answer 1

Explanation:

This triangle is isosceles. That means that two angles are equal and thus two sides are equal: Since FG = 18 in, EF is also 18 in.

The sum of the interior angles must be 180 degrees. Therefore,

23 deg + 23 deg + <F = 180 deg, or

<F = (180 - 46) deg = 134 deg.

Answer 2

Please let me know if this makes sense