5IMO Ch5 geometry angles line polygons

An angle that forms a square corner is called 

• a right angle
• an acute angle
• an obtuse angle
• a straight angle

• parallel lines
• perpendicular lines
• intersecting lines
• a ray

• parallel lines

• perpendicular lines

• a parallelogram

• a ray

• parallel lines
• perpendicular lines
• intersecting lines
• a ray

• parallel lines
• perpendicular lines
• intersecting lines
• a ray

What is this?

• Points

• Dots

• Lines

• Line segment

What is this?

• Line segments

• line

• point

• end caps

What does the image show?
(The whole thing, not just the points)

• a ray
• a line
• parallel lines
• line segment

Parallel lines ...

• will never intersect
• intersect to form right angles
• are curved lines

Perpendicular lines...

• will never intersect
• intersect to form right angles
• are curved lines