posted by Mariana .
The diagonals of a rectangle are 12 inches long and intersect at an angle of 60 degrees. Find the perimeter of the rectangle.
The angle bet. the diag. and the long
side = 30 deg.
X = 12cos30 = 10.4in = l0ng side.
Y = 12sin30 = 6in = short side.
P = 2*10.4 + 2*6 = 32.8in.