The perimeter of a circle=πr², where π=22/7. find the area of r=21cm
1 answer:
EXPLAINATION: 
ANSWER: 1386 
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5 seconds it will hit the water.
Step-by-step explanation:
y=-16t²+400
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divide both sides by 16
t²=-25
t=√25
t=5
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Fabio lo bye bye
