Question

How do you find the circumference of a circle? Show two different formulas.

Answer 1

2.Find the circumference of a circle with radius 8 inches.
3.How do you find the area of a circle?
4.Find the area of a circle with diameter 18 ft.
5.How do you find the arc length? Explain the two methods learned in this section.
6.Find the arc length of a sector that is 125° and has a radius of 20 in.
7.How do you find the area of a sector? Explain the two methods learned in this section.
8.Find the area of three-fifths of a circle with radius 15 ft.
9.What is the arc measure of an arc with length 4.189 cm and radius equal to 3 cm.
10.What is the arc measure of a sector with area 38.485 ft2 and radius 7?

Answer 2

@jkim3592

Answer 3

you need to know the necessary formulas for circumference,area ,...etc.

Answer 4

yes that is apparent. so what are they?

Answer 5

hope you have learned in your school

Answer 6

so for circumference C = 2pi*r

Answer 7

area of a circle =pi*r^2

Answer 8

you need to continue and us it

ok ?

Answer 9

yes this is good!

Answer 10

are there anymore that i need to know to be able to solve these problems?

Answer 11

yes for 5,6,7,9,10

there need using formulas for arc the circle ,so what you need to get from your math book so if you not have learned it again

Answer 12

i dont have a matchbook. its all online. and besides dude, people come to openstudy to get help, not told to go other places to find it. or told i should know it already!

Answer 13

@vinnv226 do you know?

Answer 14

C=πd. But what does that mean? There are three elements in this equation to figure out. These are:
C, which is the circumference. This is the number you're looking for;
d, which is the mathematical shorthand for diameter, and is the distance between the widest part of a circle, measured across the center; and finally
π, or pi, which is pronounced "pie". Pi is an infinitely long number, but in this case, 3.14 will be close enough for fencing out the neighbors.