Question

What is mZB?
B
51°

Help please

Answer 1

Answer: B = 78

Explanation:

The triangle is isosceles which means that two of its sides are equal. The rule is that since two sides are equal the angels opposites to these sides are equal to each other as well. This means that angle C equals 51 as well. We know that the triangle angles at up to 180 so then m of angle b is equal to 180 - (51 + 51)

= 180 -102

= 78

Answer 2

∠B = 78°

Explanation:

since it is an isosceles triangle, ∠C = ∠A = 51°

∠B = 180° - 51° - 51° = 78°