4 years ago

Find the value of x.

Mathematics

1 answer:

serg [7]4 years ago

4 0

Answer:

x = 25

Step-by-step explanation:

The Exterior Angle Theorem states that the exterior angle of a triangle is equal to the sum of the two opposite interior angles.

This means that

3x - 10 = 25 + (x+15)

3x - 10 = x + 40

Subtract x from both sides of the equation.

2x - 10 = 40

Add 10 to both sides.

2x = 50

Divide both sides by 2.

x = 25

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