Answer:
m∠Y = 60
WY = 7 in
Explanation:
It's an isosceles triangle (2 sides are equal), therefore m∠W = m∠Y because the base angles of an isosceles triangle are equal.
Sum of interior angles of a triangle is 180.
let x = m∠W = m∠Y
2x + 60 = 180
2x = 180 - 60 = 120
x = 120/2 = 60
m∠Y = 60
Since all 3 angles = 60, now we know it's an equilateral triangle, therefore WY = 7 in