test4

Question 1

circle:

Answer 1

a circle is a set of all points in a plane that are the same distance from the center of the circle.

Question 2

radius:

Answer 2

a radius is a line segment that is from the center of the circle to a point on the circle.

Question 3

chord:

Answer 3

a chord is a line segment with endpoints on the circle.

Question 4

diameter:

Answer 4

a diameter is a chord that passes through the center of the circle.

Question 5

circumference:

Answer 5

the distance around the circle

Question 6

formula for radius:

Answer 6

r=d÷2

Question 7

formula for diameter:

Answer 7

d=rx2

Question 8

formula for circumference:

Answer 8

c=2𝜋r

Question 9

central angle:

Answer 9

a central angle is an angle with a verte at the center of the circle and sides which are radii.

Question 10

arc:

Answer 10

an arc is a part of a circle that is defined by two endpoints

Question 10

what is the sum of the measures of all central angles?

Answer 10

360°

Question 11

m<1+m<2+m<3=

Answer 11

360°

Question 12

minor arc:

Answer 12

a minor arc has a measure of less than 180°

Question 13

major arc:

Answer 13

a major arc has a measure greater than 180°

Question 13

semicircle:

Answer 13

a semicircle has a measure of exactly 180°

Question 13

congruent arcs:

Answer 13

congruent arcs are arcs that have the same measure.

Question 14

arc length:

Answer 14

the distance between the endpoints of an arc measured along the arc in linear units.

Question 15

formula of length:

Answer 15

l= x/360° . 2𝜋r

Question 16

radian:

Answer 16

a unit of measurement to measure angles.

Question 17

degrees→radians

Answer 17

a x 𝜋/180°

Question 18

radians→degrees

Answer 18

a x 180°/ 𝜋