Unit 7 Circles Retest

Front

What is a circle?

Back

A circle is a shape consisting of all points in a plane that are a given distance from a fixed point, called the center.

Front

What is the diameter of a circle?

Back

The diameter is the longest distance across the circle, passing through the center, and is twice the length of the radius.

Front

What is the radius of a circle?

Back

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

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is given by the formula C = πd, where d is the diameter.

Front

What is the relationship between the radius and diameter?

Back

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

Front

What is a tangent to a circle?

Back

A tangent is a line that touches the circle at exactly one point and is perpendicular to the radius at that point.

Front

How do you find the length of an arc in a circle?

Back

The length of an arc can be found using the formula: Arc Length = (θ/360) * C, where θ is the angle in degrees and C is the circumference.

Front

What is the formula for the area of a circle?

Back

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

Front

How do you calculate the perimeter of a triangle?

Back

The perimeter of a triangle is the sum of the lengths of all three sides.

Front

What is the relationship between the angles in a triangle?

Back

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