Sorry that is not a linear model. There is not a constant rate of change. Are you sure you copied it correctly
Well if you know the top and the bottom are equal and the two sides are equal. So just add them up
Lets assume center point of circle as O
OD is the radius of circle . so OD is also 7
All the sides of the triangle are equal . so angle at the center O is 60 degree.
radius = 7
Length of arc CD = 
= 
= 
= 
Answer:
No Solution.
Step-by-step explanation:
x+y=8
y=3-x
-------------
x+(3-x)=8
x+3-x=8
x-x+3=8
0+3=8
3=8
no solution