Shapes and symmetry

Circles and polygons

Name: ______________________________Date: ______________Score: ______ / 20

1.
What is a chord of a circle?
1. Aa straight line from one point on the circumference to another
2. Ba line touching the circle at one point only
3. Cthe distance all the way round
2.
What is a chord that passes through the centre called?
1. Athe diameter
2. Ba tangent
3. Ca radius
3.
A circle has a diameter of 36 cm. What is its radius?
cm
4.
What makes a polygon REGULAR?
1. Aall its sides and all its angles are equal
2. Bit has an even number of sides
3. Cit has a line of symmetry
5.
Which line goes from the centre of a circle to its edge?
1. Athe radius
2. Bthe chord
3. Cthe tangent
6.
Every diameter is a chord.
True False
7.
A circle has a radius of 3 cm. What is its diameter?
cm
8.
What is the name of a polygon with 7 sides?
1. Aoctagon
2. Bheptagon
3. Cnonagon
9.
A circle has a diameter of 44 cm. What is its radius?
cm
10.
What is the name of a polygon with 8 sides?
1. Anonagon
2. Bdecagon
3. Coctagon
11.
A circle has a diameter of 58 cm. What is its radius?
cm
12.
What is the name of a polygon with 9 sides?
1. Anonagon
2. Bdecagon
3. Ctriangle
13.
A circle has a diameter of 54 cm. What is its radius?
cm
14.
A regular nonagon has how many equal angles?
15.
A circle has a diameter of 8 cm. What is its radius?
cm
16.
A circle has a radius of 28 cm. What is its diameter?
cm
17.
How many sides does a nonagon have?
18.
A circle has a diameter of 18 cm. What is its radius?
cm
19.
What is the name of a polygon with 5 sides?
1. Ahexagon
2. Bpentagon
3. Cheptagon
20.
A circle has a radius of 8 cm. What is its diameter?
cm

Answer key

Shapes and symmetry — Circles and polygons

1.A. a straight line from one point on the circumference to another
2.A. the diameter
3.18 cm
4.A. all its sides and all its angles are equal
5.A. the radius
6.True
7.6 cm
8.B. heptagon
9.22 cm
10.C. octagon
11.29 cm
12.A. nonagon
13.27 cm
14.9
15.4 cm
16.56 cm
17.9
18.9 cm
19.B. pentagon
20.16 cm