Vocab
An angle with its vertex at the center of a circle
What is a Central Angle
A portion of the circumference of a circle.
What is Arc Length
When finding the area your answer is units....
What is Squared
Angle measurement of a circle
What is 360-degrees
What is a right angle or 90-degree angle
a line segment whose endpoints are on the circle.
What is a Chord
Joe has a pizza with a circumference of 1600 units. He cut the pizza into 10 even slices. The arc length of one slice of pizza is....
What is 160 units
The area of a circle is 24. The area of the semi-circle would be...
What is 12 units2
Angle measure of a semi-circle
What is 180-degrees
Degree equivalency to pi/4
What is 45-degrees
The distance from the center of a circle to any point on the boundary
What is Radius
With an angle of 90- degrees, a radius of 4, the arc length would be...
What is 2pi units or 6.28 units
Dr. Sparks has a pizza with 8 slices. The area of the whole pizza is 32, the area of one slice would be...
What is 4 units2
This is the measure of the angle that makes up a quarter of a whole circle
What is a right angle or 90-degrees
What is 7pi/6
A special type of Chord
What is a Diameter
With an angle of 25-degrees, a radius of 2, and a circumference of 4-pi, the measure of the arc length is...
What is 5pi/18 units or 0.87 units
A circle with radius of 3 cm, and an central angle of 120-degrees, has a sector area of...
What is 3pi cm2 or 9.42 cm2
This is the relationship of an inscribed angle and its intercepted arc.
What is the angle is half the measurement of the arc
Circle A has a radius of 3 units and an arc length of 4pi and circle B has a radius of 9 units and an arc length of 12pi. What is the scale factor?
What is a scale factor of 3 units
A line that touches the circle at exactly one point
What is a Tangent
With a central angle of 30 degrees, a radius of 8, the arc length would be...
What is 4pi/3 units or 4.19 units?
A circle with a radius of 1.5 units and a central angle of 270-degrees has a sector area of..
What is 1.6875pi units2 or 5.3 units2
This is the relationship between opposite angles of a quadrilateral inscribed in a circle.
What is they add up to 180-degrees (Supplementary angles)
Approximately 1 radian equals how many degrees?
What is 57 degrees