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The three interior angles of a triangle is 180°. One angle is 10 more than the first angle. While the third angle is 20 more the thrice the first. Find the measure of the three angles

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angle a = x

angle b = x + 10

angle c = 3x + 20

x + x + 10 + 3x + 20 = 180

5x + 30 = 180

5x = 180 - 30

5x = 150

x = 30

angle a = x = 30°

angle b = x + 10 = 30 + 10 = 40°

angle c = 3x + 20 = 3(30) + 20 = 110°

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Answer:

1st angle 30

2nd angle 40

3rd angle 90

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