Its a cirlce. completely shaded EXCEPT theres a little cirlce inside the cirle thats unshaded. the radius of the circle to the other cirlce inside is 10 cm. and the radius of the little circle is 2 cm.
2007-01-12 12:17:33 · 4 answers · asked by mellow 1 in Science & Mathematics ➔ Mathematics
Please...think about this before asking others. Find the area of the big one and subtract the area of the small one.
2007-01-12 12:21:13 · answer #1 · answered by mjatthebeeb 3 · 0⤊ 0⤋
You must find the area of the big circle, then find the area of the little circle. Subtract the value of the first from the second. Finding the area of a circle is pretty simple. You know the radius. Take the radius of a circle and use it in the equation A=(pi)*r-squared. For example, the area of a circle with a radius of 5, you would do this: (3.14...) * (5) * (5).
2007-01-12 20:25:28 · answer #2 · answered by Aviva Dibrov 2 · 0⤊ 0⤋
If I understood well, there is a circle inside another circle...
A = the area of the big circle, with radius 10cm
B = the area of the short circle, with radius 2cm
Area of a circle = Ï. R^2 , where R is the radius of the circle..
Ashaded = A - B
Ashaded = (Ï. 10^2) - (Ï . 2^2)
Ashaded = Ï.(100 - 4)
Ashaded = Ï. 96
Ï ~3,1415
Ashaded ~3,1415. 96
Ashaded = 301,584cm^2
2007-01-12 20:26:40 · answer #3 · answered by Anonymous · 0⤊ 0⤋
A = pi * r^2
A1 = pi * 10^2 = 100pi
A2 = pi * 2^2 = 4pi
100pi - 4pi = 96pi
The area of the shaded area is 96pi cm^2 or about 301.59289cm^2
2007-01-12 23:42:07 · answer #4 · answered by Sherman81 6 · 0⤊ 0⤋