Find the value of m in the diagram above.
∠EHI = ∠DEH = 40° (alternate angles are equal) ∠BEH = 90° (given) ∠BED = 90° - 40° = 50° ∠BEF = 180° - 50° = 130° (sum of angles on a straight line is 180o) ∠BEF = ∠ABE = 130° (alternate angles are equal) ∴ m = 130°
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