Question

I don’t really understand how to do this

Answer 1

<A = 63degrees

Explanation:

From triangle DEF;

<D + <E + <F = 180

87 + 30 + <F = 180

117 + <F = 180

<F = 180 - 117

<F = 63degrees

Since <A = <F based on similarities, then <A = 63degrees