Question

If the radius of the circle is 42 cm, then what will be the circumference of the semicircle?​

Answer 1

Answer:

132 cm

Step-by-step explanation:

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Answer 2

Answer:

Hence, value of circumference of semi circle will be 216 cm

Step-by-step explanation:

In context to question asked,

We have to determine the circumference of semi circle.

As per data given in the question,

We have,

Radius of semi circle = 42 cm

As we know that,

Circumference of semi circle is equal to half of circumference of circle plus value of diameter.

So, we have,

Formula for finding the circumference of semi circle as,

$Circumference \:C = (\Pi r + 2r), \\where \:'r' \:is \:the\: radius.$

So, for determining the value of circumference of semi circle we will put the value of radius in above formula.

Thus we will get.

$C = \Pi r +2r \\= \frac{22}{7}\times 42 +2\times 42\\=>(22 \times 6) + 84\\=>132+84 = 216\:cm$