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80 degrees

Step-by-step explanation:

<F is congruent to <G because the angles are opposite to equal sides.

So, The ratio of <G is also 4

So  <F:<G:<H = 4:4:1

=> 4x+4x+x = 180 (Angles of a triangle add up to 180 )

=> 9x = 180

Dividing both sides by 9

=> x = 20

Now, the measures of angles,

=> <F = 4x = 4(20) = 80°

=> <G = 4x = 4(20) = 80°

=> <H = x = 20°

56.25

Step-by-step explanation: