Circle Vocabulary

Question 1

Circle

Answer 1

All points in a plane that are a given distance from a given point

Question 2

Diameter

Answer 2

The chord that intersects the center of the circle

Question 3

Radius

Answer 3

1/2 the diameter. Measure from the center to the curve.

Question 4

Tangent

Answer 4

A line that intersects a circle at only one point

Question 5

Secant

Answer 5

A line that intersects a circle at two points

Question 6

Chord

Answer 6

A line segment with endpoints on the circle

Question 7

Circumference

Answer 7

The distance around the circle. The perimeter of the circle.

Question 8

Inscribed circle

Answer 8

A circle is inscribed in a polygon if it is tangent to the sides of the polygon

Question 9

Inscribed polygon

Answer 9

A polygon is inscribed in a circle if it’s vertices are tangent to the circle.

Question 10

Circumscribed circle

Answer 10

A circle that passes through the vertices of a polygon. The polygon is inscribed in the circle.

Question 11

Arc

Answer 11

A portion of the circle’s circumference

Question 12

Sector

Answer 12

A portion of the circle’s area.

Question 13

Central Angle

Answer 13

An angle whose vertex is at the center of the circle

Question 14

Inscribed angle

Answer 14

An angle whose vertex is on the circle.

Question 15

Intercepted arc

Answer 15

An arc whose endpoints are on the sides of an inscribed angle.