Area of a circle?

Question

I'm basically a Year 9 who has her maths exams tomorrow and hasn't revised.

Can someone tell me how to work out the area of a circle?

Answer 1

Pi r squared. Pi x the radius squared. pi being 3.14

Answer 2

The formual is pi-r-squared.

Pi = 3.1415926
r = the distance from the centre to the edge = 1/2 the length of a line drawn right across the middle of the circle from side to side.

So, if r = 5cm, then r-squared = 5*5 = 25.
So the area would be 3.1415926 * 25 on your calulator.
Or, 25pi cm-squared.

You should have paid more attention in class ;-)

Answer 3

The area of a circle is worked out by multiplying pi(3.14)by the radius of the circle after squaring it.So your formula is pi r squared.

Answer 4

the area of a circle is worked out by multiplying pi by the radius².

Answer 5

A = pi * r^2. Or Area = Pi * radius squared. A= 1/2d^2*pi.

Answer 6

the area of a circle is pi times the radius squared. find out the radius and multiply it by itself and then times that by pi (or 3.14)

Answer 7

RxRxPi=Area Of a Circle
r=radius
pi-3.14

Answer 8

enable's setup an occasion enable's say the realm of the sq. is two, so the section is 4 If the realm of the sq. is two, the radius of the inscribed circle could desire to be a million. section = ?r² = ? The ratio of the areas is: ratio = ?/4 = 0.785 So a splash better than 2/3. .

Answer 9

Area of a circle is pi(3.14) x r(radius squared), meaning you multiply the radius by itself, then multiply it by 3.14.

Answer 10

pi * the radius of the circle (the distance from the centre to the perimeter) then square what you get.

πr^2

good luck