My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum


Reply
 
LinkBack Thread Tools Display Modes
August 10th, 2009, 03:12 PM   #1
Newbie
 
Joined: Aug 2009

Posts: 1
Thanks: 0

Geometric ratios

How do I answer these questions? I would like the answer to so I can check the work but I need to know the steps please.

1. The volumes of two similar figures are 729 mm cubed and 2744 mm cubed. If the surface area of the larger figure is 393 mm squared what is the surface area of the smaller figure?

2. The surface area of two figures are 16 in squared and 25 inches squared. If the volume of he larger figure is 500 in cubed, what is the volume of the smaller figure? Answer must be in squared.
metallic.panda is offline  
 
August 10th, 2009, 03:44 PM   #2
Senior Member
 
Joined: Apr 2007

Posts: 2,140
Thanks: 0

1. We can determine the surface area of such figure from using the formula of , where letting an such object having volume of and surface area of , and the other object having volume of and surface area of . Let , and , because such an object has both volume of and surface area of and . Solve for by plugging in the known values .
johnny is offline  
August 11th, 2009, 12:12 AM   #3
Global Moderator
 
Joined: Dec 2006

Posts: 20,919
Thanks: 2201

2. Similarly, required volume = 500(16/25)^(3/2) in, etc. (Note: cubed, not squared, since it's a volume.)
skipjack is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
geometric, ratios



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Trigonometric Ratios bilano99 Trigonometry 2 November 12th, 2012 10:56 AM
Ratios linhbui Elementary Math 4 August 22nd, 2012 06:24 AM
Help with Trignometric Ratios jatt-rockz Trigonometry 5 November 10th, 2011 12:17 PM
Ratios MathematicallyObtuse Algebra 3 January 9th, 2011 08:07 AM
Ratios/fractions MathematicallyObtuse Algebra 4 January 1st, 2011 05:04 PM





Copyright © 2019 My Math Forum. All rights reserved.