GEOMETRY

Angles in Triangles

Angles in Triangles

The sum of the interior angles in a triangle is 180o

Find x

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70 + 80 + x = 180

150 + x = 180

(-150) (-150)

x = 30o

Isosceles triangle

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this triangle has: 2 equal sides and 2 equal interior angles

180 – 30 = 150o

x = 150 2 (2 equal angles)

x = 75o

Right angled triangle

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a + b = 90o

Equilateral triangle

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This triangle has: 3 equal sides and 3 equal interior angles of 60o each