Parts of Circles
What is the distance around the outside of the circle?
Circumference
What is the radius of a circle with a diameter of 10 ft?
5 ft
What is the area formula for a circle?
A = 3.14 * r 2
What is the circumference formula for a circle?
C = 3.14 * d OR C = 2 * 3.14 * r
What is the relationship between two or more angles that add together to 180 degrees?
Supplementary Angles
What is the line segment that goes from the center of the circle to ONE side.
Radius
What is the diameter of a circle with a radius of 8 in?
16 in.
What is the area of a circle that has a radius of 9 cm?
254.34 cm2
50.24 miles
What do we call 2 angles that are OUTSIDE a set of parallel lines, are on OPPOSITE sides of the transversal, and are CONGRUENT?
Alternate Exterior Angles
The distance ACROSS the circle from edge to edge, goes through the center of the circle.
Diameter
What is the diameter of a circle with a radius of 3.347 m?
6.694 m
What is the area of a circle that has a radius of 3.5 miles?
38.465 mi2
What is the circumference of a circle with a diameter of 30 ft?
94.2 ft
What do we call two or more angles that add together to 90 degrees are called what?
Complementary Angles
The measure of the inside of a circle, measured in square units
Area
What is the diameter of a circle with a circumference of 72.22 miles?
23 miles
What is the area of a circle that has a diameter of 22 meters?
379.94 m2
What is the circumference of a circle with a radius of 14.25 cm?
89.49 cm
What do we call 2 angles that are INSIDE a set of parallel lines, are on OPPOSITE sides of the transversal, and are CONGRUENT?
Alternate Interior Angles
The relationship between a circle's circumference and diameter is calculated to be what value?
Pi or 3.14
What is the radius of a circle if it has a circumference of 56.52 inches?
9 inches
What is the area of a circle with a diameter of 41.25 inches?
1335.73 in2
What is the circumference of a circle with a diameter of 9.75 km?
30.615 km
What do we call two angles that are formed from intersecting lines and are OPPOSITE each other? They are also CONGRUENT.
Vertical Angles