Problem understanding perimeter of a rectangle on basic multiplication...

RB89

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of a book I borrowed from the library.

The name of the book is "Arithmetic: The Easy Way" by Edward Williams and Katie Prindle.

I checked out the 1996 version (which is the only version my library has) of the book.

I'm on chapter four (which is a chapter on basic multiplication) and got all the questions right on the pre-test accept the geometry type questions.

I'm stuck on the part where it explains about the perimeter of a regtangle (2L + 2W). I understand the forumla,but only halfway understand how to write a shape / problem into a formula.

Here is the question:

"Write a formula for the perimeter of this triangle (it shows a picture of a triangle with two a's (on the right and left sides) then a b at the bottom). Complete the formula, writing it in its simplest form as was shown earlier." - pg.119 chapter 4

I just need similar problems like this to practice with. The thing about the book is that it only has one problem like this. Are there any other books / websites where I can get similar problems like this?

Sorry if the post is too long,

Thanks,
RB
 
Last edited:
of a book I borrowed from the library.

The name of the book is "Arithmetic: The Easy Way" by Edward Williams and Katie Prindle.

I checked out the 1996 version (which is the only version my library has) of the book.

I'm on chapter four (which is a chapter on basic multiplication) and got all the questions right on the pre-test accept the geometry type questions.

I'm stuck on the part where it explains about the perimeter of a regtangle (2L + 2W). I understand the forumla,but only halfway understand how to write a shape / problem into a formula.

Here is the question:

"Write a formula for the perimeter of this triangle (it shows a picture of a triangle with two a's (on the right and left sides) then a b at the bottom). Complete the formula, writing it in its simplest form as was shown earlier." - pg.119 chapter 4

I just need similar problems like this to practice with. The thing about the book is that it only has one problem like this. Are there any other books / websites where I can get similar problems like this?

Sorry if the post is too long,

Thanks,
RB

Go to:

http://www.purplemath.com/modules/perimetr.htm
 
I'm stuck on the part where it explains about the perimeter of a regtangle (2L + 2W). I understand the forumla,but only halfway understand how to write a shape / problem into a formula.
Here is the question:
Sorry if the post is too long,
Your question is clearly not too long.
Your question is about "the perimeter" of a simple closed curved.
A rectangle has a very strict definition: A simple closed curve that is that is the union four line segments, no two of which has more than one point of intersection. Each two intersecting line segments are perpendicular. Its perimeter is the sum of lengths of the four line segments.
 
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