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postnew [5]
3 years ago
7

Find angle x

Mathematics
2 answers:
Crank3 years ago
8 0

Answer:

x = 80 degree

Step-by-step explanation:

angle B = 100 degree (being vertically opposite angle)

angle B + angle x = 180 degree ( being same side interior angles or also said as co interior angles )

100 + x = 180

x = 180 - 100

x = 80 degree

kari74 [83]3 years ago
8 0

Answer:

x=80^{\circ}

Step-by-step explanation:

The answer is correct and the reasoning is fine. I'd mention that that \angle x corresponds with angle \angle ABC and since \angle ABC and \angle CBD form one side of a line, they are supplementary (add up to 180 degrees). Therefore, x=180^{\circ}-100^{\circ}=\boxed{80^{\circ}}.Your reasoning is correct as well, but maybe just add on and explain that m\angle B=m\angle CBD because they are vertical angles.

In addition, I have a hard time believing a computer will be able to grade the reasoning portion of the question well. It's entirely possible it isn't giving you credit for that because it needs to be manually graded.

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