A circle is 360° all the way around; therefore, if you divide an arc's degree measure by 360°, you find the fraction of the circle's circumference that the arc makes up. Then, if you multiply the length all the way around the circle (the circle's circumference) by that fraction, you get the length along the arc.
Answer:
value of x is 7
Step-by-step explanation:
from question
k+b=90
5x+15+40=90
5x=90-55
5x=35
hence, x=7
No it would be Pi *r *r because the r is to the power of 2
Answer:

Step-by-step explanation:
The formula for the area of a circle is : 
To work this out you would first have to work out the area of the circle. You can do this by multiplying pi by 8 squared, this gives you 201.06. This is because in order to calculate the volume you must calculate the area of one face of the shape.
The next step is to multiply 201.06 by 10, this gives you 2010.62.
1) Multiply pi by 8 squared.

2) Multiply 201.06 by 10.
