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area and perimeter math

Mathematics
Tutor: None Selected Time limit: 0 Hours

Hello my son is needing help understanding some areas in 4th grade math

Apr 19th, 2015

areas for what shapes?  circles, trapezoids, quadrilaterals, triangles

for squares and rectangles the area would be the side length times the width.

for trapezoids, add the length on top, to the length on the bottom, then multiply by the height, then divide by 2

for circles find the length from the center to edge, multiply that length by itself, and then multiply by 3.14 which is pi

for triangle multipply the bottom length to the height of the triangle and divide by 2



message for any confusion i can help better if you give me a an example

Apr 19th, 2015

Ok he is saying rectangles and quadrilaterals

Apr 19th, 2015

quadrilaterals consists of any 4 sided closed shape.

Area means all the inside space that can be covered.   the side length of a rectangle may measure 4inches, and the width can be 3, so the area is 12.

you multiply how long the rectangle is to how wide it is.  only squares and rectangles follow this rule

Apr 19th, 2015

Is there any way you can show him a example...he is still not understanding the concept on how it works

Apr 19th, 2015

A rectangle has a length of 8 centimeters and a width of 3 centimeters. Find the area.[IMAGE>

 = (8 cm) ยท (3 cm) = 24 cm2
remember to put cm^2 because it 2 dimensions length and width

Apr 19th, 2015

Ok so the reason why you are saying to put the cm^2 is because both sides have the dimension of 2 equal sides? Am I correct?

Apr 19th, 2015

no, the squared means there are two sides, length and width. The unit of length is cm, the unit of width is also cm, so if you multiply them, you get cm*cm=cm^2

Apr 19th, 2015

And u multiply 8x3 to get the answer of 24cm^2

Apr 19th, 2015

yeah. 8cm*3cm=24cm^2. 

Apr 19th, 2015

Ok he understands how u got that answer.. He was thinking that he has to add it together... what shapes is it where he has to add all the sides together?

Apr 19th, 2015

you add all the sides together when you want to find the perimeter of the rectangle

Apr 19th, 2015

you add all the sides together when you want to find the perimeter of the rectangle

Apr 19th, 2015

ok thanks so much for your help

Apr 19th, 2015

no problem. If you have any questions, please let me know. 

Apr 19th, 2015

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