Sanai Ball
2022-10-09
Answered

Find the radius of a circle with a circumference of $45\pi $ centimeters

You can still ask an expert for help

beshrewd6g

Answered 2022-10-10
Author has **12** answers

The formula of a circumference of a circle:

$C=2\pi r$

r-radius

We have the circumference

$C=45\pi \text{}cm$

Substitute:

$2\pi r=45\pi \text{divide both sides by}\pi \phantom{\rule{0ex}{0ex}}2r=45\text{divide both sides by 2}\phantom{\rule{0ex}{0ex}}r=22.5\text{}cm$

$C=2\pi r$

r-radius

We have the circumference

$C=45\pi \text{}cm$

Substitute:

$2\pi r=45\pi \text{divide both sides by}\pi \phantom{\rule{0ex}{0ex}}2r=45\text{divide both sides by 2}\phantom{\rule{0ex}{0ex}}r=22.5\text{}cm$

asked 2021-08-12

Three pipes, each of radius length 4 in., are stacked as shown. What is the exact height of the stack?

asked 2021-08-14

Five circles are placed in a rectangle as shown. If the length of the shorter side of the rectangle is 1, find the length of the other side.

asked 2021-09-14

If the atomic radius of lead is 0.175 nm, find the volume of its unit cell in cubic meters

asked 2021-08-14

Two circles, whose radii are 12 inches and 16 inches respectively, intersect. The angle between the tangents at either of the points of intersection is $20}^{\circ},\text{}{30}^{\prime$ . Find the distance between the centers of the circle.

asked 2022-03-03

The circumference of two circles are $12\pi$ and $36\pi$ . Find the ratio of the areas of the circles.

a)$1:3$

b)$1:9$

c)$3:4$

d)$2:5$

a)

b)

c)

d)

asked 2021-08-01

ABCD is a square with sides 8 cm long. Two circles each with radius 8 cm are drawn, one with center A and the other with center C.

Find the area of the region inside both circles.

Find the area of the region inside both circles.

asked 2022-02-13

ind the area of the shaded region. Round to 2 decimal places.