Math Is Fun Forum

luvpuppy24u@yahoo.com

Member

Registered: 2011-01-06

Posts: 1

7th grade mathh

How do i find the missing number to a triangle. the question says,

The sum of th lengths of the sides of triangle ABC is 25 in. The lengths of AB and BC are 9 in and 8 in. Find the length of side AC??

PLEASE helpp mehhh!!!!

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 7th grade mathh

Hi lovepuppy;

Welcome to the forum!

Now you know that all 3 sides when added ( sum ) are 25 inches. You know that one side is 9 inches the other side is 8 inches. There are 3 sides to a triangle. So if 8 + 9 = 17 inches for the two sides all you have to do is subtract from the 25 inches.

25 - 17 = 8. The remaining side AC is 8 inches.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
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