If ir means not, then irrational means not rational. Pi is and irrational number.
To find the amount of fabric for one side of the purse you will find the area of the trapezoidal space that is created. The latch is on the top, so the 2 in is not necessary information.
A = 1/2 h(b1 + b2)
1/2 x 13 x (10 + 16)
A = 169 square inches of fabric will be needed.
9/11 is rounded to 1. It rounds up because 9 is higher than 5, which is the middle of 11.
