Equations of circles and such.

Front

What is the standard equation of a circle with center (h, k) and radius r?

Back

(x - h)² + (y - k)² = r²

Front

What does the term 'radius' refer to in a circle?

Back

The distance from the center of the circle to any point on its circumference.

Front

What is the formula for finding the circumference of a circle?

Back

C = 2πr, where r is the radius.

Front

If a circle has a diameter of 10 inches, what is its radius?

Back

5 inches.

Front

What is the area of a circle with a radius of 3 inches?

Back

A = πr² = π(3)² = 28.26 square inches (using π ≈ 3.14).

Front

What does 'circumference' mean?

Back

Distance around a circle.

Front

How do you find the diameter of a circle if you know the circumference?

Back

Diameter = Circumference / π.

Front

What is the relationship between the radius and diameter of a circle?

Back

Diameter = 2 × Radius.

Front

What is the area of a circle with a diameter of 8 inches?

Back

A = πr² = π(4)² = 50.24 square inches (using π ≈ 3.14).

Front

What is the center of a circle?

Back

The point that is equidistant from all points on the circumference.