In how many ways can four students line up at a bus stop?
2 answers:
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The answer must be 
since the triangular pyramid has 4 faces and each has an area of 30 
we should multiply that by 4 , so :
Check the picture below.
since we know that x = 3/7, we can then plug that on either of the twin legs, since it's an isosceles, and get the length of each leg, so say let's plug it in 5x + 16
