Answer :

I'm not sure if this is right... ( if you search up the internet... it tells you the formula and you just have to fill in the missing pieces like the length, base, and height.) I got... 207.23... Good luck on finding the right answer!  
Rienn
Im pretty sure it A=1/2bh

So just multipy 9 by 7 then divide by a 1/2

The 7.8 is just x-tra imformation to confuse you

I dont know if this is correct but its how i was tought

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