Find the perimeter of a semi circle of diameter 10cm.
2007-08-17 08:17:54 · 12 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
The permiter of a circle is pi * the circle's diameter.
Well, you only have 1/2 of a circle, so the formula for the permiter would be
1/2 * (pi) * d PLUS D
The first half of the equasion would be for the curvy part, the arc, the second part would be for the straight diameter.
So you have
1/2*(pi)*10 + 10
that's about 25.71
(NINI's wrong because she found the permiter of just the arc part of the circle, NOT the straight part which would also be counted... and she's a math major?)
2007-08-17 08:29:24 · answer #1 · answered by Perdendosi 7 · 0⤊ 1⤋
The circumference of a circle is Pi * diameter. So the circumference of half the circle is Pi*d/2. To calculate the perimeter you must add the length of the diameter.
So (Pi*(10/2))+10 cm =25.708cm
2007-08-17 08:31:26 · answer #2 · answered by hersheba 4 · 1⤊ 1⤋
Perimeter or Circumference of 1 full circle = π (or 3.142) x Diameter (or D). πD = 3.142 x 1 = 3.142 units. Perimeter of the semicircle = 1 + 1.571 = 2.571 Units.
2016-04-01 20:32:59 · answer #3 · answered by ? 4 · 0⤊ 0⤋
'pi' multiplied by diameter (d) = circumference of circle.(Oce)
ie 3.1416 times 10 = Oce.
This product gives 31.416 as the Oce.
Therefore the perimeter or length of the semi circle is one half of the total perimeter or 15.708
2007-08-17 11:35:39 · answer #4 · answered by Anonymous · 0⤊ 1⤋
it worries me that so many people forgot to add on the 10 at the end for the joining line across the diameter.
2007-08-17 10:45:54 · answer #5 · answered by jim G 2 · 1⤊ 0⤋
pi x 10 /2 + 10
2007-08-17 08:25:19 · answer #6 · answered by Anonymous · 3⤊ 1⤋
Formula to calcaute Perimeter of a full circle is 2*pi*r.
radius = 5 cm
pi = 3.14
P = 2 * pi * r = 2 * 3.14 * 5 = 31.4 cm
So for semi-circle, it's half of full circle.
31.4 / 2 = 15.7 cm
2007-08-17 08:28:21 · answer #7 · answered by Athena 1 · 1⤊ 4⤋
perimtr of a circle is 2(pi)R.....
therfore R=10/2cms=5cms
2*3.14*5=31.4cms
P=31.4cms(of circle)
therefore to find perimeter of a semicircle divide by 2......
P(semicircle)=31.4/2=15.7ms
its damn easy!!!!
2007-08-17 08:34:19 · answer #8 · answered by Anonymous · 0⤊ 3⤋
15.7
perimeter = (2x3.14x10/2)/2
2007-08-17 10:46:47 · answer #9 · answered by rach 2 · 0⤊ 1⤋
1/2Pi*D
3.142/2*10=15.71cm+10cm=25.71cm
2007-08-17 08:27:53 · answer #10 · answered by Grandad 4 · 1⤊ 2⤋