It's a kite or a rhombus.
X=36.... because 17-36=19
A because the formula is s^2h/3 and if you plug it in, it's A.
Find the area of the rectangle. 39 times 16=
624-pi (radius squared)
624-3.14 times 8 squared
624- 200.96
423.04 cm ^2
There are numerous ways you can do this, but take a look at the attachment to see how I did it. I hope it answers your question! :)