Friday

December 19, 2014

December 19, 2014

Posted by **Jessica** on Sunday, July 8, 2012 at 12:29pm.

Question 2

What is the surface area, in square inches, of a sphere with radius 3.5 in.? Use Pi and round your answer to the nearest hundredth, if necessary.

Question 3

Whats is the volume of a sphere with a radius of 18 cm?

LAST QUESTION

What is the volume of a sphere with a diameter of 23 in.?

Round to the nearest tenth.

A 1807.5

B.1982.4

C.2103.6

D.2027.8

- MAth -
**Steve**, Sunday, July 8, 2012 at 1:36pm1. a = 4pi*r^2

28.26 = 4*3.14*r^2

r = 3/2, so diameter = 3

2. use above formula

3. v = 4/3 pi r^3 = 4/3 * 3.14 * 18^3 = 24416.64

4. use above formula. To estimate, 4/3 * pi is about 4. 4*11.5^3 = 6083. Hmmm. Nothing close. (?)

- MAth -
**Bosnian**, Sunday, July 8, 2012 at 1:37pmA = 4 pi r ^ 2

A = 28.26

28.26 = 4 pi r ^ 2

28.26 / ( 4 pi ) = r ^ 2

r ^ 2 = 28.26 / ( 4 * 3.14 )

r ^ 2 = 28.26 / 12.56 = 2.25

r = sqrt ( 2.25 ) = 1.5 in

Question 2

A = 4 pi r ^ 2

A = 4 * pi * 3.5 ^ 2

A = 4 * 3.14 * 12.25

A = 153.86 in ^ 2

Question 3

V = 4 * pi * r ^ 3 / 3

V = 4 * 3.14 * 18 ^ 3 / 3

V = 4 * 3.14 * 5832 / 3

V = 73249.92 / 3

V = 24416.64 in ^ 3

LAST QUESTION

V = 4 * pi * r ^ 3 / 3

V = 4 * 3.14 * 23 ^ 3 / 3

V = 4 * 3.14 * 12167 / 3

V = 152817.52 / 3

V = 50939.1733 in ^ 3

V = 50939.2 in ^ 3

rounded to the nearest tenth

**Answer this Question**

**Related Questions**

Math - Using the formula for the surface area of a SPHERE: Use Pi = 3.14 If the ...

Algebra - the surface area of a sphere is a=4 pie r squared where r is the ...

MATH - Find the diameter of the sphere to the nearest inch given the surface ...

Math - Are these correct: 1a) Find the lateral surface area in square inches of ...

Math - Are these correct 2a) For the cone, find the Lateral Surface Area in ...

Math Can someone check my answers ? - What is the surface area of a circle that ...

math: advanced geometry - a sphere has a volume of 12,348pi cubic inches. Find ...

Math ASAP - Height: 10 inches Base Perimeter: 40 inches Lateral Surface Area: ...

mathematics - What is the solution for this? The surface area of a sphere varies...

Math ASAP - Height: 10 inches Base Perimeter: 40 inches Lateral Surface Area: ...