Which of the following could be the lengths of the sides of a triangle? a. 1,2,1
b.2,3,1
c.3,5,4
d.7,15,7

C

Step-by-step explanation:

The general rule is that any two leg lengths must exceed the third.

A) won't. 1 + 1 = 2. The 2 ones lay flat across the 2.

B) 2 + 1 = 3. Won't work for the same reason as A

C) works fine. Any 2 will exceed the third.

D) can't happen. 7 + 7 < 15.

false.

step-by-step explanation:

false.

cavalieri's principle makes that statement about the volumes, not about the areas.