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3 years ago

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Mathematics

2 answers:

jeka943 years ago

8 0

Answer:

Option A.

Step-by-step explanation:

1. BC ║ ED [Given}

2. m∠ABC = 70° [Given}

3. m∠CED = 30° [Given]

4. m∠ABC = m∠BED [Corresponding angle theorem]

5. m∠BEC + m∠CED = m∠BED [Angle addition postulate]

6. m∠BEC + 30° = 70° [Substitution property of equality]

7. ∠BEC = 40° [Subtraction property of equality]

Therefore, option A is the answer.

cestrela7 [59]3 years ago

7 0

Answer: the answer is c

Step-by-step explanation: m BEC + 30° = 70° Substitution property of equality

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