The diameter of the circle would be a line going through the center of the circle connecting to both sides.
The radius of a circle would be a line only going to the the center, or in other words, half the circle.
I hope this makes sense!
M= 40h + 200
m= The total amount of money the designer make
h= number of hours
1.60
2. 70
3. 12 x 2, 8 x 3, 6 x 4
4. 18 x 2 , 12 x 3, 4 x 9
not sure for the first 2 but hope this helps