1. The vertical end of a trough is trapezoidal in shape, with dimensions provided. The area is calculated to be 1.89 square meters. 2. A square ABCD has a side of length x. An equilateral triangle BEC is inscribed inside the square, with BC equal to x. To calculate the angle AED: a sketch is made, with altitude EF drawn and shown to bisect BC at the midpoint; GE is then calculated to be {(2 - √3)x}/2; and tan(AED) = GE/EF to find the angle.