Unit 8

Question 1

Area formula

Answer 1

A= pi (r) squared

Question 2

Circumference formula

Answer 2

C=2 (pi) (r)
OR
C= (pi) (diameter)

Question 3

Area of a sector formula

Answer 3

A= X times pi r squared /360

Question 4

Radius

Answer 4

A segment with endpoints in the center and on the edge of the circle

Question 5

Chord

Answer 5

A segment with endpoints on the edges of the circle

Question 6

Diameter

Answer 6

A chord that passes through the center (diameter=2(radius))

Question 7

Secant

Answer 7

A line that intersects the circle in exactly 2 places

Question 8

Tangent

Answer 8

A line that intersects the circle at exactly 1 point

Question 9

Point of tangency

Answer 9

Where a tangent hits the circle

Question 10

Central angle

Answer 10

An angle with a vertex at the center and 2 sides that are radii

Question 11

Inscribed angle

Answer 11

An angle with a vertex on the circle and 2 points that are chords

Question 12

Arc

Answer 12

A portion of the edge of the circle defined by 2 endpoints

Question 13

Minor arc

Answer 13

An arc with a measure less than 180 degrees (use 2 letters to name it)

Question 14

Major arc

Answer 14

An arc with a measure greater than 180 degrees (use 3 letters to name it)

Question 15

Semicircle

Answer 15

An arc with endpoints on the diameter (ALWAYS=180 degrees exactly)