IMO Practice Test: 2D Shapes & Symmetry | Class 4 Mathematics

Question 1 of 6 hard

A regular polygon with 8 equal sides has how many lines of symmetry?

8

4

2

6

Explanation: A regular octagon has 8 lines of symmetry.

Question 2 of 6 medium

How many corners do a triangle and a pentagon have altogether?

8

7

9

10

Explanation: 3 + 5 = 8 corners.

Question 3 of 6 hard

A regular polygon's number of lines of symmetry equals its…

number of sides

number of diagonals

area

perimeter

Explanation: A regular polygon has as many symmetry lines as sides.

Question 4 of 6 hard

How many triangles can a hexagon be split into by drawing lines from one corner?

4

6

3

5

Explanation: A hexagon splits into 4 triangles from one corner.

Question 5 of 6 hard

Two triangles are joined to form a square. How many sides does the square have?

4

6

3

8

Explanation: The outer shape, a square, has 4 sides.

Question 6 of 6 medium

A polygon with 7 sides is a…

heptagon

hexagon

octagon

pentagon

Explanation: A 7-sided polygon is a heptagon.

IMO Practice Test — 2D Shapes & Symmetry