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torisob [31]
3 years ago
5

Calculate the perimeter of a semi circle whose radius is 21cm​

Mathematics
1 answer:
torisob [31]3 years ago
6 0

Radius of semicircle r = 21 cm

Perimeter of semicircle

= pi*r + 2r

= (22/7)*21 + 2*21

= 22*3 + 42

= 66 + 42

= 108 cm

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Read 2 more answers
Simplify. Please and thank you.
Ivan
<span>Cancel <span>r2</span>
</span><span><span><span>(s4t)</span>/(</span><span>s<span>t3)</span></span></span>
2 <span>Use Quotient Rule: <span><span><span>xa/</span><span>xb</span></span>=<span>x^<span>a−b</span></span></span>
</span><span><span>s^<span>4−1</span></span><span>t^<span>1−3</span></span></span>
3 <span>Simplify <span>4−1</span> to 3
</span><span><span>s^3</span><span>t^<span>1−3</span></span></span>
4 <span>Simplify <span>1−3</span> to <span>−2</span>
</span><span><span>s^3</span><span>t^<span>−2</span></span></span>
5 <span>Use Negative Power Rule:<span><span>x^<span>−a</span></span>=<span>1/<span>xa</span></span></span>
</span><span><span>s^3</span>×<span>1/<span>t2</span></span></span>
6 <span>Simplify
</span><span><span>(s3)/(</span><span>t2)</span></span>
Done so the answer is a. then
8 0
3 years ago
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