How to find the length of the diameter

Practice Questions

GRE Quantitative Reasoning › How to find the length of the diameter

Questions

Quantity A: The diameter of a circle with area of $109\pi$

Quantity B: The diameter of a circle with circumference of $22\pi$

Which of the following is true?

Quantity A: The diameter of a circle with area of $81\pi$

Quantity B: The diameter of a circle with circumference of $30\pi$

Which of the following is true?

The formula to find the radius of the largest circle that can fit in an equilateral triangle is $\text{Radius }= \frac{S}{2\sqrt{3}}$ , where is the length of any one side of the triange.

What is the largest diameter of a circle that can fit inside an equilateral triangle with a perimeter of cm?

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