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Mathematics 7 Online
rxcklesskaisher:

Lisa has to cut her grandma's grass this weekend and wants to know exactly how much area she will be cutting. Calculate the area of the polygon. Be sure to show all your work and explain your answer. (PLEASE WRITE SENTENCES EXPLAINING)

rxcklesskaisher:

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AZ:

I actually answered this question this morning

rxcklesskaisher:

where?

AZ:

To find the area of the polygon, let's split it into two different trapezoids like this: I also went ahead and wrote down the side lengths from the information they gave you

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rxcklesskaisher:

only i have \to put sentences

AZ:

Okay, we can do that too. Were you able to calculate the area of the trapezoid?

rxcklesskaisher:

give me a sec...

rxcklesskaisher:

what am i caculating?

rxcklesskaisher:

what numbers

AZ:

The area of each trapezoid..

AZ:

\( \sf Area ~of~a~ trapezoid = \left(\dfrac{base_1 + base_2}{2}\right) \times height\)

AZ:

What is the area of the first trapezoid? |dw:1616861030250:dw| Base 1 is 26 Base 2 is 6 and the height is 20

rxcklesskaisher:

7

AZ:

how did you calculate that

rxcklesskaisher:

i have no clue

AZ:

the first base is 26 the second base is 6 the height is 20 area = 20 * (26+6) /2 what is 26 + 6 =

rxcklesskaisher:

32

AZ:

okay now what is 32/2 =

rxcklesskaisher:

16

AZ:

now what is 20 * 16

rxcklesskaisher:

320

AZ:

so that's the volume of the first trapezoid does that make sense?? Area = height * (base1 + base2) /2 height is 20 base1 is 26 base2 is 6 Area = 20 * (26+6)/2 Area = 20 * (32)/2 Area = 20 * 16 Area = 320

AZ:

Does that make sense????

AZ:

we still have to find the area of the second trapezoid

rxcklesskaisher:

ok

AZ:

What is the area of the second trapezoid? |dw:1616861679831:dw| Base 1 is 16 Base 2 is 10 and the height is 6

AZ:

Can you do the same exact thing and find the area? Area = height * (base1 + base2) / 2 Plug in the numbers

rxcklesskaisher:

53

AZ:

how even

rxcklesskaisher:

i dont knowww

AZ:

plug in the numbers |dw:1616862109130:dw|

rxcklesskaisher:

ohhh

rxcklesskaisher:

13

AZ:

what did you do to get 13

rxcklesskaisher:

16+10 \ 2

AZ:

okay, and then multiply it by 6

rxcklesskaisher:

78

AZ:

so that's the area of the second trapezoid the first one had an area of 320 the second one had an area of 78 the total area of the polygon is the area of both trapezoids combined together what is 320 + 78 = ?

rxcklesskaisher:

398

AZ:

so that's your final answer- the area that she'll be cutting

rxcklesskaisher:

how do i put all that in sentences

snowflake0531:

+ as plus * as multiply a number as a number / as division ._.

AZ:

Write down everything we did To calculate the area of the polygon, we have to split it into two trapezoids. The area of the first trapezoid is ... show all your work here The area of the second trapezoid is ... show all your work here The total area of the polygon is area of first trapezoid + area of second trapezoid which would be _____

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