1) The perimeter is the sum of the lengths of the straight edge (the diameter of the semicircle) and the length of the arc of the semicircle.
The circumference of a 4 ft circle is π*diameter = π*4 ft ≈ 12.566 ft The semicircle will have a length that is half that, 6.283 ft. When this length is added to the diameter, the perimeter is found to be Perimeter = 4 ft + 6.283 ft ≈ 10.3 ft.
2) The area of a circle is given by the formula A = (π/4)d² For a diameter of 15 inches, the area is A = (π/4)(15 in)² = 56.25π in² A ≈ 176.7146 in²
