Question

Find the perimeter

PLEASE TELL​

Answer 1

Answer:

12pi......

Step-by-step explanation:

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Answer 2

Answer:

37.68 cm

Step-by-step explanation:

We can see that there are 4 semicircles

To calculate the perimeter of the smaller semi-circle:

Radius = 4/2 = 2 cm

Perimeter = πR = 3.14×2 = 6.28 cm

Perimeter of 3 such semicircles = 3×6.28 = 18.84 cm

∵ the diameter of 3 semicircles together make a big semicircle

∴ radius of big semicircle = 4+2 = 6 cm

Perimeter = 3.14 × 6 = 18.84 cm

Total perimeter = 18.84+18.84 = 37.68 cm