Ghostrider Ghostrider
  • 21-11-2023
  • Mathematics
High School

Two semicircles are used to make the shaded shape below. One semicircle has a diameter of 12, and the other has a diameter of 20. Work out the perimeter of the shaded shape.

Answer :

thilagaratnamkumuthi thilagaratnamkumuthi
  • 18-09-2024

Before finding perimeter find radius using diameter

R = d/2
= 12/2
= 6

1st semi circle = 2 π r
= 2 × 3.142 × 6. ( π is a Greek letter)
= 37.704 cm


R =d/2
= 20/2
= 10

2nd semi circle = 2 π r
= 2 × 3.142 × 10
= 62.84cm

Total perimeter = 62.84 + 37.704
= 100.544 cm
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