CDEF is a parallelogram. Find each measure

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2

x/3-10=8

x/3=18

x=48

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.