120 sq metres.
To see how you get this answer, read on:
If the sides are a, b and c, then calculate s = 0.5*(a+b+c)
Then the area is sqrt[s*(s-a)*(s-b)*(s-c)]
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-7m + 20 = -17m - 1010m = -30m = -3
22
No
The area of a triangle is one-half the product of the base and the height. Therefore, the base of this triangle must be 60/10 = 6 meters.
1/2*10*base = 30 base = 6 m