What is the relationship between the center of any circle and the point that lie on the circle?

The distance between the center and any point on the circle is the radius. That's likely what your book or teacher is asking for. 

Note: double the radius and you get the diameter

I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.