Question

in triangle abc angle A is equal to 100 degree and a b is equal to AC then find Angle B

Answer 1

make a triangle in which angle is equal 100 degree and it is given that a b is equal to AC so let them XX because the angle opposite to the equal sides are equal and take angle sum property in triangle abc X + X + 100 is equal to 180 degree 2 X + 100 is equal to 180 degree and 2 x is equal to 80 degree x is equal to 40 degree so angle b is equal to 40 degree

Answer 2

hi,here is your answer
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given:
A=100°
AB=AC
so,this is isosceles triangle
angleB=angleC
A+B+C=180°
100°+2B=180
2B=80°
B=40°