1.

In triangle ABC,angleB=angleC and angleA=100 find angle B

Answer»

Answer:

40

Step-by-step explanation:

angle B= angleC

angle A=100

let angle B =X

then angle C =x............(because angle B= angle C)

the SUM of three ANGLES in a triangle =180

so

Angle A +angle B + angle C=180

100+x+x=180

100+2x=180

2x = 180-100

2x = 80

x = 80/2

x = 40

then, angle B = 40



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