Circles

O is the centre of the circle.

Which one of the following is the radius of the circle?

• CD

• AB

• CO

The figure shows 2 circles. Do they have the same diameters?

• Yes

• No

A circle has a radius of 8 cm. What is its diameter?

Ans: ________ cm

Tags

CCSS.7.G.B.4

The diameter of a circle is 14 cm. What is the radius of the circle?

Ans: ________ cm

Tags

CCSS.7.G.B.4

O is the centre of the circle.

Find the circumference of the circle. (Take π = 22/7)

Ans: ___________ cm

Tags

CCSS.7.G.B.4

Which of the following is/ are the formula to find circumference of a circle?

There may be more than one answer.

• 3.14 x diameter

• calculator π x diameter x ½

• 22/7 x diameter

• 3.14 x radius x radius

• π x d

Tags

CCSS.7.G.B.4

The figure shows a square in a circle.

AB is 14 m long. What is the diameter of the circle?

Ans: ________m

Tags

CCSS.HSG.C.A.2

The figure shows a square in a quarter circle.

OA is 28 cm. What is the radius of the quarter circle?

Ans: ________ cm

Tags

CCSS.HSG.C.A.2