if a semi-circle has a radius of 6cm, what is its area??

Answer 1

18(pi) sq cm

Answer 2

Note that the area of a full circle is given by the formula
A = pi(r^2)

All we have to do is solve for the area of the full circle, and then divide it by 2 after. Or, we could just divide by 2 now, stating

(1/2) A = (1/2) pi (r^2)

Plugging in r = 6, we get

= (1/2) pi (6^2)
= (1/2) pi (36)
= 18pi

Best to leave your answer in its exact form; any decimal representation would only be an approximation.

Answer 3

Area of a circle = pi x r^2 where r = radius

Area of the semi-circle = (1/2) x pi x 6^2 = 56.55 cm2

Answer 4

Area of a semi circle is given by the formula (pi*R^2)/2

So putting pi = 22/7 and R = 6 in the above relation, the area is obtained as 56.57 sq.cm

Answer 5

circle area = pi*R square = 3.14159 * 36
Semi Circle area = 1/2 circle area = 3.14159 * 18
approximate 56.55

Answer 6

Area of a circle is Pi x radius squared. Therefore semi circle is Pi x radius squared divided by 2.
3.142 x (6x6) all divided by 2
answer 55.56 squ cms

Answer 7

AREA OF A CIRCLE = PI*R^2

AREA OF A SEMI-CIRCLE = 1/2 THAT

I.E. PI*R^2/2 OR = 56.5 CM^2

Answer 8

Circle's area = pi r^2
since it's a semi-circle then its area can be calculated as follows:
[pi r^2]/2
= [3.14 * 36] / 2
=56.54 cm^2

Answer 9

use area sector... As/ area of circle= the part of the circle you're looking for

look for area of circle first

A circle= pi*r²
A circle= 3.1416* 6²
A circle=113.0976

then look for the area of the semi-circle..
As/ 113.0976= 1/2
As=113.0976(1/2)
As=56.5488

Answer 10

area of semi circle = ¶r² / 2 = (3.14 x 6²) / 2 cm²
= 56.5 cm²

Answer 11

Circle area is PI x Radius^2

So it's half that.

Circle = 113.09 sq cm

semicircle = 56.548 sq cm