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.

- anonymous

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- anonymous

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- anonymous

please help @shinebrightlikeadimon @johnweldon1993

- anonymous

ok so this polygon is an irregular polygon there is no equation to find it

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## More answers

- anonymous

so first you need to cut the polygon into pieces that can be calculated

- Loser66

Suggestion: find the biggest one, then subtract the irrelevant parts.

- anonymous

|dw:1433606810579:dw|

- Loser66

@MLG360GABEN What is the formula to find area of a rectangular?

- anonymous

and what formula to find triangles?

- anonymous

umm A=bh/2 ?

- Loser66

to find area of a square also. You need them all to solve this problem. Please, state them out

- anonymous

@MLG360GABEN what is the formula for a square?

- anonymous

A= a divided by 2 ?

- anonymous

no the area of a square is A=bh
b=base h=height; sound familiar?

- anonymous

kind of

- anonymous

im confused

- anonymous

yes, now look at the pic i drawn above, there is a triangle towards the top left......right?

- anonymous

yes

- anonymous

would that be 40?

- anonymous

no can you write the formula for the triangle and try again?

- anonymous

A= bh x 2

- anonymous

@MLG360GABEN you just stated the formula above...... A=(bh)/2

- anonymous

so 72?

- anonymous

what does the slash mean?

- anonymous

divide

- anonymous

ohh

- anonymous

18?

- anonymous

or 36?

- anonymous

here'\[A= \frac{ (20\times20) }{ 2 }\]s the formula:

- anonymous

give me a hint

- anonymous

well, 20x20 is 400

- anonymous

is it lower or higher than a 100

- anonymous

because i got 200

- anonymous

well you are correct

- anonymous

so its 200?!

- anonymous

YEAAAAA

- anonymous

thank YOU for all your time im sorry if I was frustrating

- anonymous

no problem

- anonymous

thanks bye :)

- anonymous

now you need to find the area of the rectangel to the right

- anonymous

ok

- anonymous

so you remember the formula?

- anonymous

A=bh

- anonymous

so its A=6x36 right?

- anonymous

can you find the area?

- anonymous

i'll try

- anonymous

its just multiplying :)

- anonymous

so its just 216

- anonymous

great!

- anonymous

is that all did i do it

- anonymous

now you need to subtract the smaller triangle from 216

- anonymous

210

- anonymous

you still need the formula for triangle! A=(bh)/2

- anonymous

A=(6x6) / 2

- anonymous

228?

- anonymous

no the area of the triangle is 18

- anonymous

yes i got that

- anonymous

now subtract 216-18

- anonymous

198

- anonymous

198

- anonymous

now add that to the area to the big triangle to the left

- anonymous

200+198=???

- anonymous

398

- anonymous

goood job!! thats your final answer

- anonymous

yay!!

- anonymous

:)

- anonymous

so how should I explain this in my essay?

- anonymous

hmmm everything we have talked about before, how you split up the polygon into pieces and found the areas. then you added them together and got the final answer.
and dont forget to mention the formulas

- anonymous

ok thanks :)

- anonymous

bye

- anonymous

good luck :)

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