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IrinaK [193]
2 years ago
12

In plane ABC the measure of angle A equals 42° the measure of angle B is five times the measure of angle C find the measure of a

ngle B and the measure of angle C.
Mathematics
1 answer:
krok68 [10]2 years ago
7 0

Step-by-step explanation:

I think what is meant in the triangle ABC we have the three angles.

the sum of all angles in a triangle is airways 180 degrees.

so,

180 = A + B + C

180 = 42 + B + C

now, we know also that

B = 5×C

so, we can use that above

180 = 42 + 5×C + C

138 = 6×C

C = 138/6 = 23 degrees

B = 5×C = 5×23 = 115 degrees

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