Parts of a circle

In this question use a pair of compasses. The line shown is the diameter of a circle, centre X.

Draw the circle.

A sphere has diameter 20 cm

Show that the radius of the sphere is 10 cm

The volume of a sphere is r³ where r is the radius. Work out the volume of a sphere with diameter 20 cm Give your answer in terms of

A chord is drawn on a circle. Which statement is correct? Tick one box.

Here is a circle, centre O

Match each letter to the correct word. One has been done for you.

This shape is made from a semicircle and a square.

On the centimetre grid below, make an accurate drawing of the shape.

Choose a word from the list below to complete each sentence.

arc centre circumference diameter

radius sector segment tangent

The diagram shows a circle, centre O, and three straight lines.

Use one word to describe each shaded region. Choose from

arc chord sector segment tangent

The diagram shows a circle, centre O, and three straight lines.

Use one word to describe each shaded region. Choose from

arc chord sector segment tangent

Write down the name of a triangle with three equal sides.

Write down the name for the straight line inside this circle.

AC is a diameter of a circle, centre E. E is the midpoint of BD.

Prove that triangle ABE is congruent to triangle CDE.

A circle has diameter 10 cm Circle the radius.

5 cm 10 cm 20 cm 100 cm

A and B are points on a circle. C is the centre of the circle.

Tick one box for each statement.

Part of this circle is shaded.

Circle the name of the shaded part.

arc sector chord segment

Which of these parts of a circle is a curve? Circle your answer.

circumference diameter centre radius

What is the name of the longest possible chord in a circle? Circle your answer.

tangent circumference radius diameter

This circle has centre C. W, X and Y are points on the circle. WY is a straight line.

Tick one box for each statement.

On a circle, which of these is not a straight line? Circle your answer.

circumference radius chord diameter

On a circle, which of these is always longer than the diameter? Circle your answer.

chord arc radius circumference

A circle has radius 4.2 cm Work out the length of the circumference. Give your answer to 1 decimal place.

The circle below has centre O. Draw a sector on the circle.

Here is a circle.

Circle the word that describes the shaded part.

segment chord sector arc

A, B, C, D, E and F are points on a circle.

Circle the line that is a diameter of the circle. BE AD AC BF

A circle is drawn on a centimetre grid.

Draw a tangent to the circle.

Grace works out that the area of the circle is more than 9 cm² Why must this be wrong?