Answer :

mw473766
what you want to do is use pthygorean theorem ( think i spelled that right) A square plus B square = c Square. use that for the rectangle.
you should get the answer if you do that. make sure you multiply 8 times 8 and 5 times 5. then you add what you get. i think thats how to do it. hope it helps i am almost 100% sure

Garebear
10)  The triangle is an equilateral triangle so all the side are equal ,8cm times 3 ?

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