Question

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Answer 1

Answer:

Perimeter of semi circle = 2πr / 2 = πr

= 22/7 * 14

= 44 cm

Area of semi circle = πr² / 2

= 22/7 * 14*14 /2

=308 cm²

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Answer 2

GIVEN:

• Diameter of semi-circle=14cm.

TO FIND:

• Area of semi-circle.
• Perimeter of semi-circle.

SOLUTION:

First we have to know the meaning of perimeter.

Perimeter is the sum of all sides.

Perimeter of semi-circle will be sum of half the perimeter and diameter.

r=14/2=7cm

$\sf So \: perimeter \: = \frac{ \cancel2\pi \: r}{ \cancel2} +14cm$

=πr+14cm

$\sf = \frac{22 \times 7}{7} + 14cm$

=22+14cm

=36cm

Now we find area of semi-circle.

$\sf Area \: of \: semicircle= \frac{ \pi \: r {}^{2} }{2}$

$\sf= \frac{22}{7×2} \times 7 \times 7$

=77cm²

So final answers are:-

• Area of semi-circle=77cm²
• Perimeter of semi-circle=36cm