Thursday
October 2, 2014

Homework Help: MATH

Posted by Anonymous on Tuesday, October 5, 2010 at 7:54pm.

A sphere has five times the volume of a right cone that has a radius of 4.6 cm and a height of 7.7 cm. Determine the radius of the sphere to the tenth of a centimetre.

This question is multiple choice and these were the options:

A. 2.2cm
B. 3.4cm
C. 5.9cm
D. 9.3cm

I was sure it would be 5.9 cm, but I got that marked as incorrect.

This is how I got that answer.

I found the volume of the right cone and got 170.5 cm. Then I times that by 5 and got the volume of the sphere which is 852.5 cm. The formula for the sphere is 4/3*3.14*r^3. So I divided 4 by 3 and times that by 3.14. And I got 4.186666667. Then I divided 852.5/4.186666667 and I got 203.6225114. Then I triple rooted that and got 5.88 which I rounded off to 5.9. What am I doing wrong?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

math - A right circular cone is inscribed inside a sphere. The right circular ...
Math - A sphere is inscribed in a right cone. The slant height of the cone = the...
Calculus - A cone is inscribed in a sphere of radius a, centred at the origin. ...
7th g-math - An ice-cream shop offers a small size cone and a large size cone. ...
Geometry 10th - A cone is inscribed in a sphere with a radius of 5 centimeters....
math - Two right circular cone, one upside down in the other. The two bases are ...
Calculus - Given a right circular cone, you put an upside-down cone inside it so...
Geometry - Can someone please check these for me. I have to leave answers in Pi...
Math - Find the radius of a right circular cone if its volume is 1.5 times its ...
math - A cone has a slant height of 10 centimeters and lateral area of 60pi ...

Search
Members