What is the definition of the radius of a circle? The distance from the center of a circle to a point of the circle

12. A flower garden is in the shape of a circle with radius 3.8 m. If fencing costs $2.76/m, what is the cost to put a fence around the flower garden?

13. A pizza has 12 slices. Each slice has an area of 85 cm2. What is the diameter of the pizza?
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12. the circumference of the circle is 2pi*r. lets say x is the circumference so x = 2*pi*3.8 = 23.876m. multiply x by 2.76 to get 65.898, round to get 65.90

13. the area of a circle is pi*r^2. the area of the pizza is 12*85=1020cm^2. divide by pi to get 324.676 cm^2. then find the square root to get r=18.019 cm. the diameter = 2r so multiply by 2 to get 36.038cm. I'm not sure what the problem wants to round to so you can round it yourself.

note: for these two problems i used the full pi instead of 3.14. using 3.14 will give you a different answer so it just depends. If the problem wants you to use 3.14, simply resolve the problems and use 3.14 instead of pi wherever required.