The first semester content mathematics geometry proof problem. - Training Enrollment Network

The first semester content mathematics geometry proof problem.

Solution: a B.

∴∠4=∠5

∠∠5 =∠2 = 40 & amp； ordm？

∴∠4=∠5=40&； ordm

∴∠3= 180&； ordm-∠ 1-∠4 = 180 & amp； ordm-70 & amp； ordm-40 & amp； ordm= 70 & ampordm

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