Formula Fun
What is the formula for the area of a circle?
A=(PI)R2
Name a real-world object that is circular.
What is a coin (or a clock, pizza, plate, wheel, etc.)?
What is a radius?
What is the distance from the center of the circle to the edge?
What number is used in the area formula?
What is π (pi)?
How do you find the radius from the area?
What is taking the square root of the area divided by π?
How is the area of a circle useful in real life?
What is figuring out the size of things like pizzas, gardens, pools, or circular tables?
What is a diameter?
What is the distance across the circle through its center?
What is pi (π)?
What is the ratio of a circle’s circumference to its diameter?
What is the area of a circle with a radius of 5 cm?
What is 78.5 cm²?
Calculate the area of a pizza with a diameter of 12 inches.
What is 113.1 in²?
How are radius and diameter related?
What is the diameter equals two times the radius?
Why is pi (π) important in circles?
What is because it connects the circle’s circumference, diameter, and area formulas?
If the area is 78.5 cm², what is the radius?
What is 5 cm?
A circular garden has a radius of 7 ft. What is its area?
What is 153.9 ft²?
What is the circumference of a circle?
What is C = 2πr
What is the approximate value of pi (π)?
What is about 3.14 (or 22/7)?
Explain why the area of a circle is measured in square units.
What is because area measures the amount of space inside a shape, and that space is always measured in square units?
How does the area of a circle compare to that of a square with the same diameter?
What is that a circle has less area than a square with the same diameter because the square covers all four corners while the circle only fits inside?
How does changing the radius affect the area?
What is doubling the radius makes the area four times larger because the radius is squared in the formula?
Name two famous mathematicians who contributed to the study of circles
Who are Euclid and Archimedes?