2006-10-05 05:02:16 · 14 answers · asked by asking 2 in Science & Mathematics ➔ Mathematics
area of a circle is pi r squared
where pi = 3.14
r = radius
so it is 64*3.14=200.96
for a half circle divide by 2
=100.48
2006-10-05 05:04:55 · answer #1 · answered by M.B. 4 · 2⤊ 1⤋
S=ÏR^2
semicircle=ÏR^2/2
S=Ï*8^2/2=32Ï
2006-10-05 12:04:55 · answer #2 · answered by Anonymous · 0⤊ 0⤋
A = Ïr²
1/2 A = .5 * Ï * 8²
1/2 A = 8 * 4 * Ï
1/2 A = 32Ï
2006-10-05 12:04:08 · answer #3 · answered by bequalming 5 · 0⤊ 0⤋
work out the area for a circle with a radius of 8 ft then divide by two
2006-10-05 12:03:38 · answer #4 · answered by mr_soapytitwank 3 · 0⤊ 0⤋
Area of a circle=3.14*radius^2
=3.14*8*8
=200.96 ft square.
The area of a semicircle
=Area of a circle/2
=200.96/2
=100.48ft square
2006-10-05 12:11:31 · answer #5 · answered by Anonymous · 0⤊ 0⤋
3.14 x 8ft ^2 / 2
thats the calculation
315.5072
thats the answer
you should probably round it to 315 or 316
hope this helps
btw all the other answers are wrong
2006-10-05 12:07:01 · answer #6 · answered by The one and only jamie 2 · 0⤊ 1⤋
pi times radius squared divided by 2 =
3.14 x 64/2 =
3.14 x 32 = 100.48
2006-10-05 12:06:26 · answer #7 · answered by Michael 5 · 0⤊ 0⤋
Area of a circle=Pi*R^2
Area of semi circle=
1/2*Pi*64
=32*22/7
=100.57 sqft
2006-10-05 12:06:16 · answer #8 · answered by openpsychy 6 · 0⤊ 0⤋
1/2 or pie x 64 or 22/7 x 32 can we work that out ???
7304/7 I think so 143. ? that is with out a calculater
2006-10-05 12:07:07 · answer #9 · answered by Sam's 6 · 0⤊ 1⤋
pi x r2 divided by 2
2006-10-05 12:03:57 · answer #10 · answered by Anonymous · 1⤊ 1⤋