Geometry Unit 4 Review

Front

What is a tangent to a circle?

Back

A tangent to a circle is a straight line that touches the circle at exactly one point.

Front

How do you find the length of a tangent segment from a point outside the circle?

Back

Use the formula: length of tangent = √(distance from point to center² - radius²).

Front

What is the relationship between angles formed by intersecting lines?

Back

Vertical angles are equal, and adjacent angles are supplementary.

Front

What is the sum of the interior angles of a triangle?

Back

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

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

How do you calculate the arc length of a circle?

Back

Arc length = (θ/360) × 2πr, where θ is the central angle in degrees and r is the radius.

Front

What is the definition of complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What is the definition of supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius of the circle.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius of the circle.