Question

Find the perimeter of a semi-circle with radius 4.2cm.​

Answer 1

Answer:

13.2 cm

Step-by-step explanation:

Perimeter of semi-circle:

= πr

= 22/7 * 4.2

= 22/7 * 42/10

= (22 * 6)/10

= 132/10

= 13.2 cm

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Answer 2

Answer:

13.2cm^2

Step-by-step explanation:

Perimeter of a semi circle is given by

Where r is the radius of the semicircle

$\pi \: r$

Substituting the value of pi and r we get

22/7*4.2

22*0.6=>>13.2cm^2

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