Complementary angles add up to 90 degrees. Therefore, the answer is c. 18 + 72 = 90
The factors include 1,2,4,5,8,10,20,40.
Answer:

Step-by-step explanation:
The formula of an area of a elipse:

We have:

Substitute:

Answer:
1 - 3/14
2 - 10 5/8
3 - 3/8
4 - 12 1/4
Step-by-step explanation:
numbers 1 and 3 are simple, just multiply the numerators and denominators together.
Numbers 2 and 4, you convert the mixed number to an improper fraction and multiply. Don't forget to switch the answer back to a mixed number if needed!