If a triangle has a side with length 6 and another side with length 7, which of the following could NOT be the area of the triangle?

a) 1
b) 6
c) 15
d) 21
e) 25

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  1. With two given sides a and b, the biggest area of a triangle is when the two sides are at right angles, giving an area of ab/2.
    Can you figure out which of the 5 areas is not possible?

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