Question

find the circumference of the semicircle having radius 20cm​

Answer 1

Answer:

Hey mate, here's your answer.......

Step-by-step explanation:

The formula is C= pie.r

= 22/7*20

=440/7

= 62.85 cm^2

Answer 2

Answer:

Hence, value of circumference of semi circle will be $\frac{720}{7}\:cm$

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 = 20 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.

$C = \Pi r +2r \\= \frac{22}{7}\times 20 +2\times 20\\\frac{440}{7} +40\\=>\frac{440+280}{7}\\=>\frac{720}{7}\:cm$