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Exterior Angle Inequality Theorem proof diagram with labeled points, angles, and geometric reasoning steps.

Diagram illustrating the Exterior Angle Inequality Theorem with triangle ABC and point D extending from C, showing angles and congruence proofs.

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Show Answer Key & Explanations Step-by-step solution for: 7-3: Exterior Angle Inequality Theorem - ppt download

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1. ∠BEA ≅ ∠CEF
Vertical Angle Theorem
2. BE = EC
Def. of midpoint
3. ΔBEA ≅ ΔCEF
SAS
4. ∠B ≅ ∠ECF
CPCTC
5. ∠BCD > ∠ECF
Parts Theorem
6. ∠BCD > ∠B
Transitive prop of ineq.

Parent Tip: Review the logic above to help your child master the concept of exterior angle inequality theorem worksheet.

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