# How do you find the area and circumference of a circle? What grade do you usually learn it in? And can you give an example please

2
by Morgan905

2014-08-10T01:02:55-04:00
U can find it using formulae
area = pie x r square <power 2 >
pie = 22 by 7 or 3 . 14
circumference = 2 x pie x r
x = mutiiplication symbol
u learn them from grade 6 or 7
example = find the area of circle whose radius = 7 cm
answer = 22 by 7 x 7 square < power 2 >
= 22 by 7 x 7 x7
= 22 x 7 < 7 and 7 has been cut >
= 154 cm square
example = find the circumference of circle whose radius = 7 cm
= 2 x pie x r
= 2 x 22 by 7 x r
= 2 x 22 by 7 x 7
= 2 x 22 < 7 and 7 has been cut >
= 44 cm
hope i helped :)

plz mark as best
2014-08-10T02:22:05-04:00
Area of a circle is to Pi * R(Radius)^2 circumference is Pi * Diameter
i learnt this in grade 3 but i was too smart for any of them :)
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