2006-07-27 03:50:20 · 12 answers · asked by Lisa 1 in Science & Mathematics ➔ Mathematics
The formula for the area of a full circle is: pi*r^2, so the semicircle formula would simply be half that, or: (pi*r^2)/2.
A diameter of 14m means a radius of 7m, so simply calculate:
(pi*7^2)/2 = (pi*49)/2 ~= 76.97 m^2
2006-07-27 03:53:52 · answer #1 · answered by stellarfirefly 3 · 0⤊ 0⤋
if by diameter you mean the diameter of the semicircle and not a complete circle, then
Circle Area
Diameter in this case, is the radius.
A = Pi * r^2
A = Pi * 14^2
A = 196pi
A = about 615.7522m^2
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But if by diameter you mean of the complete circle, then
A = (1/2)pi * ((d^2)/4)
A = (1/2)pi * ((14^2)/4)
A = (1/2)pi * (196/4)
A = (1/2)pi * 49
A = (49pi)/2
A = about 76.969m^2
2006-07-27 06:16:38 · answer #2 · answered by Sherman81 6 · 0⤊ 0⤋
Area of the circle is given by pi*r^2.Semicircle is half of the circle.
So the area of semicircle is 1/2(pi*r^2)
Now the diameter is 14m,so the radius will be half of it that is 7m.
Now substituting the values of r=7 & pi =3.14 in the aboue equation we get ,
area ot the semicircle=1/2(3.14*7^2)
=76.93m^2
2006-07-27 04:22:58 · answer #3 · answered by esha_sweet_19 1 · 0⤊ 0⤋
Area Of Semicircle
2016-10-08 11:36:51 · answer #4 · answered by ? 4 · 0⤊ 0⤋
The formula for the area of semicircle
A = 1/2 π r²
A = 1/2 (3.141592654 )(7)²
A = 1/2 (3.141592654)(49)
Multiplying the (7)² = 49 first
A = 1/2 ( 153.93804)
Multiplying 3.141592654 X 49 = 153.93804
A = 76.96902001
A = 76.9 Rounded to one decimal place
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The answer;
The area of the semicirle is 76.9 m
2006-07-27 05:58:25 · answer #5 · answered by SAMUEL D 7 · 0⤊ 0⤋
The formula for the the area of a whole circle is
Area = Pi * r^2
r is the radius = half the diameter so 7 m in our case
so we have Area of half the circle is (Pi 7^2) / 2 = 3.1416 * 49 / 2
= 76.96 square metres
2006-07-27 03:58:15 · answer #6 · answered by Joseph Binette 3 · 0⤊ 0⤋
Area of whole circle= (pi or 3.1416) times radius squared
Diameter =14 m.
What is the radius? It is half of the diameter.
Take that radius and square it (multiply it times itself!)
then multiply that answer by (pi) or 3.1416
Good. That is the area of the whole circle.
Can you figure it out from here?
Remember do the area of a whole circle first and then now you divide by two, you only want the area of a semi-circle!
Good luck!
2006-07-27 04:02:12 · answer #7 · answered by clsiglin 1 · 0⤊ 0⤋
the formula is (pi X radius squared)/2.
Radius = 1/2 of diameter.
so
area=3.14 X(14/2)^2
area=3.14 X 7^2
area=3.14 X 49
area=153.86
area=76.93 sq m
Hope this helps.
2006-07-27 03:57:12 · answer #8 · answered by ? 6 · 0⤊ 0⤋
since the diameter is given the formula for area of a circle is pi*D^2/4 since it is a semi circle then the area would be pi*D^2/4*2
3.14*14^2/8=76.93 m^2
2006-07-27 04:25:35 · answer #9 · answered by magneto077 2 · 0⤊ 0⤋
(3.14)(7x7) / 2
(pi)(radius squared)=area of circle
divide by 2 for semicircle
2006-07-27 03:54:35 · answer #10 · answered by Jill&Justin 5 · 0⤊ 0⤋