The measure of a triangle’s outside angle is equal to the sum of the measures of its opposite interior angles. Angle d = Angle a + Angle c ∠d = ∠a + ∠c

# Exterior angle theorem

Geometry

Yup math tutoring is an allowable use of stimulus funds. Invest in math tutoring to support student remediation and acceleration. Learn how

Geometry

The measure of a triangle’s outside angle is equal to the sum of the measures of its opposite interior angles. Angle d = Angle a + Angle c ∠d = ∠a + ∠c