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°
Answer:
1st angle 30
2nd angle 40
3rd angle 90