Question 134
Let $AB\Gamma$ be an isosceles triangle and a point $\Delta$ in its interior such that $\Delta\hat{B}\Gamma = 30^\circ$, $\Delta\hat{B}A = 50^\circ$, $B\hat{\Gamma}\Delta = 55^\circ$.
a. Prove that $\hat{B} = \hat{\Gamma} = 80^\circ$
b. Find the measure of the angle $\Delta\hat{A}\Gamma$.
a. Prove that $\hat{B} = \hat{\Gamma} = 80^\circ$
b. Find the measure of the angle $\Delta\hat{A}\Gamma$.