assuming the straws do not bend, you would need six
9
7
8
15 straws are needed
I need 100 straws.
the answer is 12
over 60
15
6
24
8 straws 4 for the square base 4 for 1 each of the sides, to meet at the top.
You need nine sides, so nine straws. But you could just use one straw and cut it into nine pieces.