using the Gregg tangent which is 0.1592 ie. r/0.1592 = circumference.
however this is not as accurate as using pi but accurate enough to a couple of dp's
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Yes.
Diameter = circumference/pi
EDIT: To find the diameter, using the circumference - you divide the circumference by the value of Pi - Snakester1962 (Supervisor)
Because the 2 shorter sides are 6 and 8 in, and it is an right triangle, this is automatically a Pythagorean Triple. This is a 6-8-10 triangle, thus, the hypotenuse is 10 in.Elsewise, you can find the answer using the plain Pythagorean Theroem:62 + 82 = x236 + 64 = x2100 = x210 = x
You multiply the circle's diameter by 3.14 (Pi) to get the circumference.