Math, asked by piyush189, 1 year ago

If circumference and the area of a circle are numerically equal ,find the diameter of a circle

Answers

Answered by Argon288

hope u can understand

Attachments:

piyush189: Find the area of circle inscribe in a square of a side a cm??????

Argon288: is side of square is 1 cm then radius of circle is 0.5 cm

Aayushi1113: its simple diameter= a and radius =a\2 area would be pi(a\2)^2

Argon288: therefore are is 3.14*0.5*0.5 cm square

piyush189: Not correct answer

Argon288: why not if pie =3.14 and side of square is 1 cm where is the problem

piyush189: You have to use value or pie =22/7

Argon288: so 22/7 *0.5 *0.5 cm square

piyush189: Ans .. Pie*a square upon 4

piyush189: If diameter of circle is increase by 40% find how much percentage its area increase???

Answered by Aayushi1113

$area \: of \: circle = \pi \: r ^{2}$
$circum. \: of \: circe = 2\pi \: r$
$\pi \: {r}^{2 \:} = 2\pi \: r$
$r = 2$
diameter = 4

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