Circles Vocabulary

How do you know this is a radius?

• It connects the center to a point on the outside of the circle.

• It connects two points on the outside of the circle and travels through the center.

• It connects two points on the outside of a circle.

• It illustrates the outside (perimeter) of the circle.

How do you know this is a circumference?

• It connects the center to a point on the outside of the circle.

• It connects two points on the outside of the circle and travels through the center.

• It connects two points on the outside of a circle.

• It traces the outside (perimeter) of the circle.

How do you know this is a chord?

• It connects the center to a point on the outside of the circle.

• It connects two points on the outside of the circle and travels through the center.

• It connects two points on the outside of a circle.

• It illustrates the outside (perimeter) of the circle.

How do you know this is a chord?

• It connects the center to a point on the outside of the circle.

• It connects two points on the outside of the circle and travels through the center.

• It connects two points on the outside of a circle.

• It traces the outside (perimeter) of the circle.

True or false: A diameter is a chord.

• True

• False

True or false: The circumference is about 3 times the diameter.

• True

• False

Tags

CCSS.7.G.B.4

True or false: The diameter is 2 times the radius.

• True

• False

Tags

CCSS.7.G.B.4

True or false: A chord is always a diameter.

• True

• False

For each quantity, decide whether circumference or area would be needed to calculate it.

1. The distance around a circular track. ​ (a)  

2. The amount of oil it takes to cover the bottom of a frying pan. ​ (b)  

3. The distance your car will go with one turn of the wheels. ​ (c)   ​

• Circumference

• Area

find the radius of the circle

• 3 m

• 1.5 m

• 1.5

• 1.5 mm

Tags

CCSS.7.G.B.4