Find the perimeter of triangle XYZ.
We have a 30 -60 -90 right triangle
The side opp the 60° angle = sqrt (3) * side opp the 30° angle
So......the perimeter is
21 + 21sqrt 3 + 42 =
63 + 21sqrt 3 =
21 ( 3 + sqrt 3 ) ≈ 99.37
