2006-11-30 09:45:56 · 5 answers · asked by ektroma_lithos 2 in Science & Mathematics ➔ Mathematics
It is half the size of a full circle.
Area of a full circle = pi r²
Area of a semi-circle = (pi r²) / 2
If you mean the perimeter, it would be half the circumference, but you'd have to add the diameter as the length of the flat side.
Circumference of a full circle = pi d
Perimeter of a semicircle = (pi d)/2 + d
2006-11-30 09:49:15 · answer #1 · answered by Puzzling 7 · 0⤊ 0⤋
Calculate as if it was a complete circle using the formula Area = pi r^2. Then divide it in half. The radius (r) is half the length of the straight edge of a semicircle.
2006-11-30 09:49:21 · answer #2 · answered by xox_bass_player_xox 6 · 0⤊ 0⤋
Just find the area of the whole circle (pi times radius squared) then divide by 2 because it's only half the circle.
2006-11-30 09:48:11 · answer #3 · answered by hayharbr 7 · 0⤊ 0⤋
the perimeter =2(pi)r/2=(pi)r
the area=(pi)r^2/2= (pi/2)r^2
2006-11-30 09:47:38 · answer #4 · answered by Greg G 5 · 0⤊ 0⤋
should be half the area of the circle.
2006-11-30 09:53:44 · answer #5 · answered by Special K 4 · 0⤊ 0⤋