Geometry circles and circumference

Hi.
You forget to ask a question! You want to apply the method but failed to tell us what the method is. Most of all you did not supply us with your attempt at these problems so that we know what kind of help you need.
 
Do you know the formula to calculate the cirumference of a circle? What is it? How can you use this formula for either problem?
 
The diameter of the circle in #8 = \(\displaystyle \sqrt{9^2 + 9^2} \) .......................Why?
 
#12 is incorrect since you added the length of the legs when you are required to first square them and add that result.
 
Please do not write that 12.72 = 12.72/2. Equal signs must be valid!!
 
Subhotosh Khan said:
The diameter of the circle in #8 = \(\displaystyle \sqrt{9^2 + 9^2} \) .......................Why?
Click to expand...
Subhotosh, I too am not seeing what you are trying to say, but then again most times I miss the obvious. Please look at the diagram again and let me know if I am missing something.
Steve
 
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