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Mathematics 9 Online
OpenStudy (rianiscool):

need help asap will give a medal What is the area of the figure? A. 24 km² B. 32 km² C. 40 km² D. 48 km²

OpenStudy (rianiscool):

OpenStudy (unanimoose):

We already considered this one. :)

OpenStudy (anonymous):

8-12 = 4, 4*4/2=8 8+(8*4)=40

OpenStudy (rianiscool):

oh sorry one min wrong ons sorry

OpenStudy (anonymous):

12-8*

OpenStudy (unanimoose):

It's fine. xD

OpenStudy (rianiscool):

What is the area of the shaded part of the figure? A. 324 mm² B. 243 mm² C. 162 mm² D. 81 mm²

OpenStudy (rianiscool):

OpenStudy (anonymous):

324-81

OpenStudy (unanimoose):

Ok, do you know how to find the area of a triangle?

OpenStudy (anonymous):

which is 263

OpenStudy (anonymous):

no sorry not 263

OpenStudy (anonymous):

243

OpenStudy (unanimoose):

Ok well. \[A = \frac { hb }{ 2 }\]

OpenStudy (anonymous):

the area of the triangle is base times height divided by 2

OpenStudy (anonymous):

yea what he has, he will explain it

OpenStudy (anonymous):

bye

OpenStudy (unanimoose):

And then we know that it is a perfect square inside so : \[A of Square = lw ~ or ~ 9^2\]

OpenStudy (rianiscool):

is the answer 162

OpenStudy (unanimoose):

That is the area of the triangle itself. We must also subtract the area of the square since it is not included in the shaded area.

OpenStudy (unanimoose):

So: \[A = 162 - 9^2\]

OpenStudy (unanimoose):

It is \[9^2\] because it is a perfect square.

OpenStudy (rianiscool):

so 81

OpenStudy (unanimoose):

Yup!

OpenStudy (rianiscool):

ok thanks

OpenStudy (unanimoose):

Np :)

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