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Help with this geometry problem

Help with this geometry problem-example-1
User Antonio Espinosa
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1 Answer

13 votes
13 votes

Answer:

∠DCA ≅ 56°

Reason: vertical angles theorem

∠DCF ≅ 144°

Reason: Angles on a straight line (DE) add up to 180°

∠ECB ≅ = 37°

Reason: Angles on a straight line (FA) add up to 180°

∠CAB ≅ ∠DCA ≅ 56°

Reason: Alternate interior angles theorem

∠CBA ≅ ∠ECB ≅ 37°

Reason: Alternate interior angles theorem

Explanation:

∠DCA ≅ ∠ECF ≅ 56°

Reason: vertical angles theorem

∠DCF ≅ 180 - 56 = 144°

Reason: Angles on a straight line (DE) add up to 180°

∠ECB ≅ 180 - 56 - 87 = 37°

Reason: Angles on a straight line (FA) add up to 180°

∠CAB ≅ ∠DCA ≅ 56°

Reason: Alternate interior angles theorem

∠CBA ≅ ∠ECB ≅ 37°

Reason: Alternate interior angles theorem

User RichyHBM
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3.1k points