Question

please answer this question....​

Answer 1

Answer:

(B) 40 degrees

Step-by-step explanation:

If angle B= 40 degrees,

Angle A - Angle B = 80 degrees

Angle A - 40 = 80 degrees

Angle A= 80+40=120 degrees

Angle B - Angle C =20 degrees

40 - Angle C= 20 degrees

Angle C= 40-20= 20 degrees

Now that we found all the angles of the triangle, they will add up to 180 degrees.

Angle A+ Angle B+ Angle C=180 degrees

120+40+20=180 degrees

Hence,  we can say that Angle B is 40 degrees.

Note: If we try this working with other measurements of angle B, then all the angles of triangle will not add up to 180 degrees and hence, will be considered incorrect.

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Answer 2

180°-80°=100°

100°-20°=80°

so angle B is 40°