Question

the tunnel opening shown is a semicircle find the area to the nearest tenth of the opening of the tunnel enclosed by the semicircle give your answer with the correct unit 23 ft

Answer 1

Diameter = 23 ft

radius = diameter/2

radius = 23/2

radius = 11.5 ft

Area of the circle = pi*r~2

Area of the circle = 3.14¨11.5^2

Area of the circle = 3.14*132.25

Area of the circle = 415.27 ft^2

Area of the tunnel = area of the circle/2

Area of tunnel = 415.27/2

Area of the tunnel = 207.6 ft^2