The Center or Radius of a Circle

Front

What is the definition of the center of a circle?

Back

The center of a circle is the point that is equidistant from all points on the circle's circumference.

Front

What is the definition of the radius of a circle?

Back

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

Front

How do you calculate the diameter of a circle?

Back

The diameter of a circle is calculated as twice the radius (d = 2r).

Front

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

Back

The diameter is twice the length of the radius (d = 2r).

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is calculated using the formula C = 2πr, where r is the radius.

Front

What is the formula for the area of a circle?

Back

The area (A) of a circle is calculated using the formula A = πr², where r is the radius.

Front

What is the measure of a right angle in degrees?

Back

A right angle measures 90 degrees.

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

How do you identify the center of a circle on a coordinate plane?

Back

The center of a circle on a coordinate plane is represented by the coordinates (h, k) in the equation (x - h)² + (y - k)² = r².

Front

What is the relationship between the angles formed by intersecting lines?

Back

When two lines intersect, the opposite angles (vertical angles) are equal, and the adjacent angles are supplementary (sum to 180 degrees).