Friday

December 19, 2014

December 19, 2014

Posted by **Dorothy** on Tuesday, May 22, 2012 at 12:48pm.

- Math -
**Reiny**, Tuesday, May 22, 2012 at 3:00pmI see the surface area as the

circular area of the base + rectangle + 1/2 surface area of the sphere

let the radius be r and the height be h

so we want to measure h+r

given:

" the silo's height i three times its' radius" ---> h+r = 3r

h = 2r

πr^2 + 2πrh + (1/2) 4πr^2 = 100

πr^2 + 2πr(2r) + 2πr^2 = 100

7πr^2 = 100

r^2 = 100/(7π)

r = 2.1324 inches

h = 4.2648 inches

so the height of the toy silo = r+h = 6.397

or appr 6.4 inches

**Answer this Question**

**Related Questions**

math - 1. Dan is building a silo on his farm in the shape of a right circular ...

Algebra - A large grain silo is to be constructed in the shape of a circular ...

math - Dave is going to leave academia and go into business building grain silos...

Algebra - I posted this earlier but the number was wrong. I don't know why it ...

math - the dome over a town hall has a parabolic shape. the dome measures 48 m ...

calculus - A 160-lb man carries a 25-lb can of paint up a helical staircase that...

Quantitative Reasoning (math) - A round silo is 60 ft tall and has a 15 ft ...

Physics(IMPORTANT) - A small object of mass m= 90 kg slides down a spherical ...

Math - A train track is 5280ft. long. After adding another foot of track, an arc...

physics - A particle of mass m is released from rest at the top of a spherical ...