Question

calculate the circumference and area of the shaded! https://pbs.twimg.com/media/BF3_sFOCEAAeXN3.png

Answer 1

The formula for calculating to arc length for a sector is:
\[\frac{ x }{360}\times 2\pi r\]
And the formula for calculating arc length for a sector is:
\[\frac{ x }{360}\times \pi r^2\]

Answer 2

Where the radius is r and x is the angle.

Answer 3

so first i think that you need calculi area of circle with radius 10 cm and like step 2. area of circle with radius 6 cm what you get subtracting 4 from 10 ,hope that is clearly sure

can you calculi it ?

Answer 4

1. area circle with radius 10 cm = 100*3,14 = 314 cm^2
2. area circle with radius 6 cm = 36*3,14 = 113,04 cm ^2

3. in case of step 1. you can writing that for 360 degree there is area of 314 cm^2

so than for 72 degree suppose x

360 ---- 314
72 --- x
--------------
x= 314*72 /360 =62,8 cm^2

4. in case of step 2. you can writing that for 360 degree there is 113,04 cm^2 area so than for 72 degree there is x

360 ----- 113,04
72 ------ x
-----------------
x=113,04*72/360 = 22,6 cm^2

so after this you need just subtracting 22,6 cm^2 from 62,8 cm^2 and will get the area of the shaded

so what will be 62,8 - 22,6 = 40,2 cm^2

hope so much that is understandably sure right and easy

good luck

bye