Question

triangle ABC is isosceles with ab = AC if angle A equal 80 degree what is the measure of Angle B​

Answer 1

Answer: 50 degree

Step-by-step explanation: since Ab = AC, therefore angle b = angle c.

As we know sum of all the angles in a triangle = 180 degree,

the angle a + angle b + angle c = 180,

80+b+c = 180,

80+b+b = 180 (since b=c),

80+2b = 180,

2b=(180-80) ,

2b= 100,

b=(100/2) ,

b= 50 degree

Answer 2

AB= Ac. (given)

therefore, angle B = angle C ( angle are equal if opposite side are equal)

in triangle ABC ,

La+ Lb+Lc =180 (angle sum property)

80+ x+x =180

2x = 180-80

2 x = 100

x=100/2

x= 50