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Angle Sum and Types of Angle Pairs
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Created October 6, 2025About this video
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Formula Bank Interior Angle Sum = (n – 2) × 180° Each Interior Angle (regular) = ÷ n
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Each Exterior Angle (regular) = 360° ÷ n Interior + Exterior = 180°
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Example: Find the sum of interior angles of an octagon (8 sides).
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(8 – 2) × 180 = 6 × 180 = 1,080° Angle Pairs Types of Angle Pairs Adjacent (share
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side & vertex) Vertical (opposite; equal) Complementary (sum = 90°)
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Supplementary (sum = 180°) Linear Pair (adjacent on a line; sum = 180°)
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