Exterior Angles of a Triangle

CONCEPTS

Properties

• The exterior angle of a triangle is the same as angles on one side of a straight line

PRACTICE PROBLEMS

Question 1 What is ∠ B (see figure below)?

-- Answer -- 51°

Straight line or ∠ XAC = 180°

∠ BAC = 180° - 150° = 30°

∠ ACB = 180° - 81° = 99°

Triangle ACB = 180° = 30° + 99° + x°, x° = 51°

ACT PRACTICE PROBLEMS

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