the radius is half of the diameter, so d = 2r , or double the radius :)
Area of rectangle in the middle = 12 * 9 = 108
Area of left triangle = .5 * 2 * 9 = 9
Area of right side triangle = .5 * 5 * 9 = 22.5
Total area = 108 + 9 + 22.5 = 139.5 square inches
The formula for the area of a triangle is (base × height)/2. 5 × 8 = 40, and 40 ÷ 2 = 20. So your answer is 20cm^2. I hope this helps!
