Question

Find the measurement of E
•56
•132
•51
•63

Answer 1

56°

Explanation:

The exterior angle property states that the exterior angle is equal to the sum of the internal angles not adjacent to it.

Given :

∠E = (5x + 4)°

∠F = 76°

∠FGM = (10x + 12)°

Solving :

∠E + ∠F = ∠FGM

5x - 4 + 76 = 10x + 12

10x - 5x = 72 - 12

5x = 60

x = 12

Substitute x in ∠E :

5(12) - 4

60 - 4

56°

Answer 2

∠ E = 56°

Explanation:

the external angle of a triangle is equal to the sum of the 2 opposite interior angles.

∠ MGF is an exterior angle of the triangle , then

10x + 12 = 5x - 4 + 76

10x + 12 = 5x + 72 ( subtract 5x from both sides )

5x + 12 = 72 ( subtract 12 from both sides )

5x = 60 ( divide both sides by 5 )

x = 12

Then

∠ E = 5x - 4 = 5(12) - 4 = 60 - 4 = 56°