Answer:
∠ Y = 60° , WY = 7 in
Explanation:
the sides WX and YX are congruent then the triangle is isosceles with base angles congruent, that is
∠ Y = ∠ W = (180 - 60)° ÷ 2 = 120° ÷ 2 = 60°
Since all 3 angles in the triangle are congruent , all 60° then the triangle is equilateral with 3 congruent sides, then
WY = 7 in