This is the equation for the circumference...
C= 2 x r x pi
r = the length of the radius
pi = 3.14159
To find to circumference just find the radius of your cricle that you want to find the circumference of. then simply multiply 2 and 3.14159 by the radius and your circumference is the answer
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Circumference of a circle = 2*pi*radius or pi*diameter
Divide the circumference by 2*pi will give the radius of the circle.
There are a few steps to rewriting expressions. The steps of rewriting expressions are finding the value of the letter and then using the common factor.
The prime factors of 42 are 2, 3 and 7
the square root of 9 is 3 so 1 +3 = 4