The isosceles trapezoid angle at the base is 60 degrees, and the lateral side is 18 cm

The isosceles trapezoid angle at the base is 60 degrees, and the lateral side is 18 cm, the smaller base is 9 cm. Find the perimeter of the trapezoid.

From the top of the trapezoid, we lower the perpendicular to the bottom base. The leg of a right-angled triangle is located opposite an angle of 30 °, is part of the lower base and is equal to half of the hypotenuse or the lateral side of 18/2 = 9 centimeters.

The bottom base is 9 + 9 * 2 = 27 centimeters.

Let’s find the perimeter.

9 + 27 + 18 * 2 = 72 centimeters.

Answer: 72 centimeters.