Unit 7B Test Review

Front

What is the measure of arc JH in a circle if it is given as 130 degrees?

Back

Arc JH measures 130 degrees.

Front

How do you calculate the arc length of a circle?

Back

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

Front

What is the exact circumference of a circle with a radius of 9 inches?

Back

The circumference is 18π inches.

Front

If a 90° sector has an area of 64π in², what is the radius of the circle?

Back

The radius of the circle is 16 inches.

Front

How do you find the value of x when given tangent lines in a circle?

Back

Use the properties of tangents and the Pythagorean theorem to solve for x.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.

Front

What is the relationship between the angle of a sector and the area of the sector?

Back

The area of a sector is proportional to the angle of the sector.

Front

How do you convert degrees to radians?

Back

Radians = degrees × (π/180).

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius.

Front

What is the definition of a tangent line in relation to a circle?

Back

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