Question

find the perimeter and area of a semicircle whose diameter is 18.2 cm
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Answer 1

Step-by-step explanation:

D = 18.2cm

r = 9.1 cm

Area = pi r square

= 22 x 9.1 x 9.1/7

= do it yourself

Perimeter = pi r + 2r

= 22 × 9.1/7 +2 × 9.1

= do it yourself

Answer 2

Answer:

Step-by-step explanation:for perimeter

c=2pie*r DIVIDE BY TWO AS SEMICIRCLE

SO c=pie*r

c=3.142*9.1

(9.1 is the radius as half of the diameter 18.2 is 9.1)

hence c=28.57cm

FOR AREA:

A=pie*rsquare DIVIDE BY 2 AS SEMICIRCLE

A=3.14*9.1*9.1 /2

A=130.01 centimetre square