Unit 8 retest

Front

In the equation (x-4)²+(x-3)²=25, what is the radius?

Back

5

Front

In the equation (x+2)²+(y-3)²=4, what is the radius of the circle?

Back

2

Front

What is the term for the angle formed at the center of a circle by two radii?

Back

Central Angle

Front

What is the measure of angle A if m∠A = 20°?

Back

20°

Front

What is the measure of angle PTQ if it is given as 140°?

Back

140°

Front

What is the formula for the radius of a circle given by the equation (x-h)²+(y-k)²=r²?

Back

r = √((x-h)² + (y-k)²) where (h,k) is the center.

Front

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

Back

Diameter = 2 × Radius.

Front

What is the definition of a circle?

Back

A circle is the set of all points in a plane that are equidistant from a given point called the center.

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

Front

What is the definition of a central angle?

Back

A central angle is an angle whose vertex is at the center of the circle and whose sides are radii.