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Vertex Angles
CONCEPTS
Vertex angles
• Opposite angles are = (∠1 = ∠4, ∠2 = ∠3, ∠6 = ∠7, ∠5 = ∠8
PRACTICE PROBLEMS
Question 1 The intersection of line l & m forms the 4 angles ∠ A, ∠ B, ∠ C, ∠ D. The measure of ∠ B is 3 ½ times the measure of ∠ A. What is the value of ∠ A?
-- Answer -- 40°
∠ A + ∠ B = 180°
∠ A = 3.5 ∠ A
∠ A = 40°
ACT PRACTICE PROBLEMS
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