Unit 7 Circles Practice Test

Front

Definition of a chord

Back

A line that stretches across the circle in any type of length, but has to be in a straight line.

Front

Write the equation of a circle with center (h,k) and radius r.

Back

(x-h)²+(y-k)²=r²

Front

What is the definition of a radius of a circle?

Back

A line segment from the centre of a circle to the circumference.

Front

What is the equation of the circle? (Choose the correct one)

Back

(x+1)² + (y+1)² = 9

Front

What does 'circumference' mean?

Back

Distance around a circle.

Front

What is the diameter of a circle?

Back

A line segment that passes through the center of the circle and has its endpoints on the circle.

Front

What is the area of a circle?

Back

A = πr², where r is the radius.

Front

What is the relationship between radius and diameter?

Back

Diameter is twice the length of the radius.

Front

What is a tangent to a circle?

Back

A line that touches the circle at exactly one point.

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where r is the radius.