Question

The radii of two circles is 3cm and 9cm. find the ratio of the two circumferences.
a. 1/9
b. 1/3
c. 2/3

Answer 1

a. 1/9
becouse\[ratio=\pi r _{1} ^{2}/\pi r _{2} ^{2}=r _{1}^{2}/r _{2}^{2}\]

Answer 2

Can you help with another one?

Answer 3

Find the length of the arc in the circle if the radius of the circle is 24 cm. and the degree of the arc is 90.
a. 24 pie
b. 12 pie
c. 6 pie

Answer 4

hall circle is 360º = 2Pie
1/4 of circle 90º =Pie/2
arc length is r*(angle in radians)
so 24*Pie/2=12Pie

Answer 5

A circle with a diameter of 16 and an area of 64 pie. find the radius.
a. 8
b. 4
c. 6

Answer 6

radius=1/2 diameter
so r=8.

Answer 7

The circle has a radius of 15. find the diameter and area.

Answer 8

a. D= 30 A= 225pie
b. D= 30 A=900 pie
c. D= 15 A = 225 pie

Answer 9

@myko

Answer 10

You may want to start a new question for that.

Answer 11

d=r*2=15*2=30
A =Pir^2=Pi15^2=pi225

Answer 12

a circle has a diameter of 12. find the radius and area.

Answer 13

dude, all quaestions are the same. Just do like i showed you