Answer: 20
Step-by-step explanation:
Let 's complete our quadrilateral to a rectangle ; and subtract from it the area highlighted in red

Answer:
C because a b and d do not show any similaritys
Answer: 47.1/15
Step-by-step explanation:
We define Circumference by C= pie X D[diameter]
Hence pie= C/ D= 47.1/15
So we have 299790000, we want to have only one digit in front of the decimal, 2.9979x10^9
hope this helps :)