How to find the surface area of a prism calculator


Asked by admin @ in Mathematics viewed by 449 People


Surface area of the semicircular right prism is _____inches squared

Answered by admin @



You will use the formula for a cylinder and halve that.

SA = pi x radius squared
SA = 3.14 x 9*9
SA = 3.14 x 81
SA = 254.34 square inches for the top and bottom half of the circle combined.

Now you need the circumference of the circle for the length of the side.

C = pi x diameter
C = 3.14 x 18
C = 56.52

56.52 / 2 = 28.26 for the length of the half circle.
28.26 x 4 = 113.04 for the curved part.

18 x 4 = 72 for the flat part.

72 + 113.04 + 254.34 = 439.38 square inches

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