Circle Vocabulary
What is an isosceles triangle?
Measures double the measure of an inscribed angle ending at the same points.
What is a central angle?
A line segment with both endpoints in the circumference of a circle.
What is a chord?
A line that touches a circle at only one point on the circumference.
What is a tangent line?
A round loaf of bread has a radius of 4 inches, find the area.
50.24 in2
A line that cuts another line into two equal halves.
What is a bisector?
Two angles that are equal if they are subtended by the same arc.
What are inscribed angles?
This bisects a chord.
What is a radius perpendicular to the chord?
The point on a tangent line that touches the circumference of a circle.
What is the point of tangency?
If the diamaer is 16 in, find the area
200.96 in2
An angle formed by two radii.
What is a central angle?
Inscribed angles in a triangle that cross the diameter measure this.
What is 90 degrees?
In this circle with centre O, AC=36m and OB=12m. What is the length of the diameter?
43.27 m
In this circle with centre O, CD is tangent to the circle at B. What is the measure of <BOA?
72 degrees
Given the diameter is 499.5 mm, find the radius
249.75 mm
An angle formed by two chords that share one common endpoint.
What is an inscribed angle?
In this circle, what is the measure of <ADC?
72 degrees.
In this circle with centre O, what is the length of chord CD?
18.65
In this circle with centre O, what is the length of CB?
11.07
Given the circumference is 6.28 feet, find the diameter.
2 ft
A piece of the circumference of the circle.
What is an arc?
In this circle with centre O, OB=7cm and CA=10cm. Find AB.
9.8 cm
In this circle with centre O, CE=5 and DO=3. What is the length of AB?
6
In this circle with centre O, AC is tangent to the circle at B. Determine the measure of <EOB.
56 degrees.
What is the summplementary angle to 34 degrees?
146 degress