Someone is laying some paving to complete to complete a square of side 7m. In the centre is a circle, diameter 5m, which is covered with cobbles.
Work out the area covered with cobbles. _____m^2
Cheers!
2007-03-04 02:15:05 · 4 answers · asked by Anonymous in Education & Reference ➔ Homework Help
It looks harder than it really is...you just need to figure out the area of the circle (which is filled with cobbles)
area = pi*r^2
r = d/2 or 5m / 2 = 2.5
area = 3.14159 * (2.5^2) = 19.635 sq meters
Now, if you're trying to compute how much area IS NOT cobbles, then you need to subtract the above result from the total area of the square
Area of square = 7m x 7m = 49 sq m
49 sq m - 19.635 sq m = 29.365 sq m
Hope that helps!
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2007-03-04 02:21:42 · answer #1 · answered by Volckhart 2 · 0⤊ 0⤋
To find the area covered with cobbles, use (pi)r(squared)...
A circle with diameter 5 has radius of 2.5, so plugging that in, we get (pi)(2.5)(squared) = 6.25(pi) which is about 19.634375 m^2. If you wanot to find out how much concrete there is, subtract that number from the area of the square, which would be 49 m^2...
2007-03-04 02:22:18 · answer #2 · answered by Chris 2 · 0⤊ 0⤋
Area of a circle is pR2 = 3.14 x (2.5)2
=19.625m2
2007-03-04 02:21:02 · answer #3 · answered by FC 4 · 0⤊ 0⤋
3.142 x 2.5 x 2.5 = 19.6375msq
2007-03-04 02:22:10 · answer #4 · answered by waspy 3 · 0⤊ 0⤋