Circles Grade 10

Circles

Grade 10

Circle

The set of points equidistant from a given point called the center

Parts of a Circle

• Radius: line segment that goes from the center to the edge of the circle (HALF the DIAMETER)

• Diameter: line segment that goes from edge to edge on a circle (TWICE the RADIUS)

• Circumference: the distance around the outside of a circle (AKA perimeter)

Multiple Choice

Name the pictured part of the circle.

• Diameter

• Sector

• Radius

• Central Angle

• Arc

Multiple Choice

What is a straight line that goes through the center of a circle from side to opposite side?

• Diameter

• Circumference

• Radius

• Center

Multiple Choice

Does this picture show the diameter or radius of a circle?

• Diameter

• Radius

Multiple Choice

A tire has a radius of 14 inches. What is its diameter?

• 14 inches

• 7 inches

• 28 inches

Fill in the Blanks

Multiple Choice

A pond has a diameter of 12 feet. What is its radius?

• 12 feet

• 6 feet

• 24 feet

Circumference

• There are two fomulas for finding circumference

• C = πd

• C = 2πr

• Circumference is a little more than 3 times the diameter

What is Pi?

• the ratio of the circumference to the diameter of a circle (π= c/d)

• a greek symbol (π)

• approximately 3.14

• used when solving area and circumference of circles

Multiple Choice

The distance around a circle; much like the perimeter of a rectangle.

• perimeter
• diameter
• circumference
• radius

Multiple Select

What is pi?

Check ALL applicable answers!

• a delicious dessert

• the ratio between circumference and diameter

• a Greek symbol

• exactly 3.14

• approximately 3.14

Circumference

These are the two formulas for finding circumference. They both use a special number called pi.

Fill in the Blanks

Multiple Choice

The region between a chord and the circle.

• Segment

• Diameter

• Tangent

• Radius

Multiple Select

A line which touches the circle but does not enter it.

• Chord

• Semi-circle

• Tangent

• Circumference

Multiple Choice

A line which joins any two points of the circle.

• Tangent

• Chord

• Arc

• Segment

Multiple Choice

A circle is a straight line segment which joins the circle's centre to any point on the circle.

• Circumference

• Diameter

• Tangent

• Radius

Multiple Select

A chord which passes through the circle's centre.

• Arc

• Diameter

• Semi-circle

• Segment

Multiple Choice

Half of the circle.

• Chord

• Arc

• Semi-circle

• Radius

Multiple Select

A part of a circle. It joins any two different points on the point.

• Chord

• Radii

• Segment

• Arc

Multiple Select

The total distance around a circle.

• Circumference

• Tangent

• Semi-circle

• Diameter