Question

Can you help me on number 4?

Answer 1

Since it's a square we just need to 27*27
Which is 729

Answer 2

you have your perimeter. 108. and a side of 27. two sides are parallel so 27+27=54. that leaves you 54. so all sides are 27 mi. take two sides and multiply. 27*27=729. there's your area!