Question

Help please

Answer 1

the steps to be followed are exactly the same as your previous question,
here you have 12 m^2 as the area of the WHOLE circle

Answer 2

So \[\frac{ 180 }{ 360}\times 21^2\]

Answer 3

yep..
assuming that 21 is a typo, it should be 12

Answer 4

72

Answer 5

and there shouldn't be 'squared' over it

Answer 6

\[\frac{180}{360} \times 3.14 \times r^2\]

area of the the whole circle =12
so
\[3.14 \times r^2 =12\]

Answer 7

3.14*12?

Answer 8

\[area~of ~sector=\frac{180}{360} \times \color{red}{ 3.14 \times r^2}\]

and
\[area~of~whole~circle =\color{red}{3.14 \times r^2=12}\]

so
\[area~of ~sector=\frac{180}{360} \times \color{red}{12}\]

Answer 9

just think of the formula for are of sector of a circle as:

\[A= \frac{\theta}{360}\times (area ~ of ~the ~whole ~circle)\]

Answer 10

@zarkam21 running into any trouble?

Answer 11

Yes, I just am a little confused

Answer 12

ok,

can you just tell me the formulas for

1. area of a circle

2. sector of a circle

(the formula in general, we are not discussing this specific question)

Answer 13

let radius=r
and angle=\(\theta\)

Answer 14

sooooo 180/360 *12

Answer 15

yep,
for this question...
if you tell me exactly which part is bothering you, i can try explaining.

Answer 16

The part that is bothering me is when they already give you the area, I get confused then

Answer 17

do you understand these formula?

\[area~of~full~circle= 3.14 \times r^2\]

and
\[~area ~of ~sector~=\frac{\theta}{360} \times 3.14 \times r^2\]

Answer 18

'r' is the radius of the circle
and \(\theta\) is the angle of the sector.

Answer 19

And if they give you the diameter insteead, you would just divide that by 2 right

Answer 20

yes

Answer 21

\[area~of ~sector=\frac{\theta}{360} \times \color{red}{ 3.14 \times r^2}\]

observe how the part of the formula marked in red, is the formula for area of a full circle

Answer 22

so we can just re-write the formula as\[area~of ~sector=\frac{\theta}{360} \times \color{red}{ area~of~full~circle}\]

Answer 23

Now for this one,