It is 4/15 im pretty sure ,
You calculate the number of ways that 2 people can be chosen from 10.
The formula:
n! / r! * (n-r)! =
10! / 2! * 8! =
10 * 9 * 8! / 2 * 8! =
10 * 9 / 2 =
45 handshakes
Source:
http://www.1728.org/combinat.htm
D.

Where (h, k) is the center of the circle and the radius is squared.
Answer:
x = 12
Step-by-step explanation:
Quadrilaterals ABCD and FECG are similar, so their corresponding sides would be in the proportion.
