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
April 24th, 2009, 08:30 AM   #1
Newbie
 
Joined: Apr 2009

Posts: 3
Thanks: 0

Beginning algebra 2.5 formulas

Hi, I need help with math. I'm taking Beginning algebra right now. I'm stuck on Formulas

3. The formula for the area of a triangle is A = 1/2ab, where b is the base of the triangle and a is the altitude of the triangle.

A) Use this formula to find the base of a triangle that has an area of 60 square meters and an altitude of 12 meters.

b) Use this formula to find the altitude of a triangle that has an area of 88 square meters and a base of 11 meters.
--------------------------------------------------------------------------------------------------------------------------------------------------------

7. A = 1/2bh solve for b
Valiant is offline  
 
April 24th, 2009, 08:36 AM   #2
Senior Member
 
Joined: Mar 2009

Posts: 318
Thanks: 0

Quote:
Originally Posted by Valiant
3. The formula for the area of a triangle is A = 1/2ab, where b is the base of the triangle and a is the altitude of the triangle.

A) Use this formula to find the base of a triangle that has an area of 60 square meters and an altitude of 12 meters.
Plug "60" in for "A". Plug "12" in for "a". Solve for "b".

Quote:
Originally Posted by Valiant
b) Use this formula to find the altitude of a triangle that has an area of 88 square meters and a base of 11 meters.
Plug "88" in for "A". Plug "11" in for "b". Solve for "a".

Quote:
Originally Posted by Valiant
7. A = 1/2bh solve for b
Multiply through by 2. Divide through by h. Simplify to get the required result.

If you get stuck, please reply showing how far you have gotten. Thank you!
stapel is offline  
April 24th, 2009, 11:16 AM   #3
Newbie
 
Joined: Jan 2009

Posts: 7
Thanks: 0

Re: Beginning algebra 2.5 formulas

Let's make it clear that the formula is A = (1/2)ab or you could say ab/2.

Quote:
A) Use this formula to find the base of a triangle that has an area of 60 square meters and an altitude of 12 meters.
First put values into your variables:
A = 60, a = 12, find b
Next write the equation with the values:
60 = (1/2)12b or 60 = 6b.
I think you can get it from there.

Quote:
b) Use this formula to find the altitude of a triangle that has an area of 88 square meters and a base of 11 meters.
Again: A = (1/2)ab
Put values into your variables:
A = 88, b = 11, find a
Next writ the equation with the values:
88 = (1/2)a(11)
Now divide both sides by 11 and you get:
8 = (1/2)a
Now multiply both sides by 2 for the answer.

Quote:
7. A = 1/2bh solve for b
A = (1/2)bh solve for b
multiply both sides by 2
2A = 2(1/2)bh
now simplify:
2A = bh
now divide both sides by h. I'll leave it to you.
bertus is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
algebra, beginning, formulas



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
Algebra, trigonometry formulas markys Algebra 2 January 14th, 2011 08:08 AM
Using Formulas in the Box? empiricus Algebra 3 December 14th, 2009 10:40 PM
Beginning Calculus? NeuroFuzzy Calculus 4 September 23rd, 2009 04:51 PM





Copyright © 2018 My Math Forum. All rights reserved.