Because F is a midpoint, that means that FG and EF are congruent to each other. So, since FG = 2, that means that EF also equals 2. Because FH also includes FG, you can take the 2 from the FG, and then take that 2 away from 8. Now you know that GH = 6. All that is left is to add all 3 of the units together (2+2+6=10).
Circunference=diameter time pi aprox pi to 3.14 circunference=200.332 subsitue 200.332=diameter time s3.14 divide both sides by 3.14 63.8=diameter answer is 63.8 units