IMO Practice Test — Lines and Angles
6 Questions • 12 min • Olympiad level
12:00
Question 1 of 6
medium
Two right angles together make…
a straight angle (180°)
a right angle
an acute angle
a full turn
Explanation: 90° + 90° = 180°.
Question 2 of 6
medium
How many 90° angles fit in a full turn?
4
2
3
6
Explanation: 360 ÷ 90 = 4.
Question 3 of 6
medium
Which letter is made of two perpendicular lines?
L
V
S
O
Explanation: The letter L has a vertical and horizontal line meeting at 90°.
Question 4 of 6
hard
Four right angles together make…
a full turn (360°)
a straight angle
an obtuse angle
180°
Explanation: 4 × 90° = 360°, a full turn.
Question 5 of 6
medium
Perpendicular lines always form an angle of…
90°
45°
180°
60°
Explanation: Perpendicular lines meet at 90°.
Question 6 of 6
hard
How many 45° angles fit in a straight angle?
4
2
3
6
Explanation: 180 ÷ 45 = 4.