Intro to Circles

Intro to Circles

Unit 4B - Circles - Math 7

Grab a BLANK graphic organizer...

You will need to turn your graphic organizer in AFTER you complete the lesson, so make sure you are following along!

Unit 4B - Circles - Math 7

DEFINITION: a line that goes from the center of the circle to any point on the circle

FORMULA: Radius = Diameter divided by 2

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Unit 4B - Circles - Math 7

RADIUS

DEFINITION: A straight line that goes from one side of a circle to the opposite side AND through the center of the circle.

FORMULA: Diameter = Radius x 2

Unit 4B - Circles - Math 7

​DIAMETER

Unit 4B - Circles - Math 7

CIRCUMFERENCE

DEFINITION: a ratio between the circumference and the diameter of a circle. It is approximately 3.14

FORMULA: Circumference divided by diameter

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Unit 4B - Circles - Math 7

Multiple Choice

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

• Diameter

• Circumference

• Radius

• Center

Multiple Choice

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

• Diameter

• Radius

Multiple Choice

What is the line that goes from the center of a circle to any point on the circle?

• Diameter

• Circumference

• Chord

• Radius

Multiple Choice

Is the red line the radius or the diameter of the circle?

• Radius

• Diameter

Multiple Choice

Is the red line the radius or the diameter of the circle?

• Radius

• Diameter

Multiple Choice

Is the red line the radius or the diameter of the circle?

• Radius

• Diameter

Multiple Choice

What is the radius of the circle?

• 18

• 72

• 38

• 14

Multiple Choice

What is the diameter of the circle?

• 8

• 16

• 10

• 4

Multiple Choice

What is the diameter of the circle?

• 5 inches

• 10 inches

• 3.14 inches

• 15.84 inches

Lesson Complete!

Make sure your graphic organizer is filled out and put your name on it. Then turn it in before you leave.

If you did not complete the graphic organizer, please RESTART the lesson.

Unit 4B - Circles - Math 7