LINES
A straight path that goes on forever in both directions.
Line
A part of a line with one endpoint that goes on forever.
Ray
Lines that never meet.
Parallel lines
Lines that meet to form a right angle.
Perpendicular lines
An angle less than 90°.
Acute
A part of a line with two endpoints.
Line segment
DAILY DOUBLE!!!
Can a ray have a length? Explain.
No, it goes on forever.
DAILY DOUBLE!!!
True or False: A student says: These lines are parallel because they look straight.
False: Lines must also never meet and stay the same distance apart
What is the measure of a right angle?
90 degrees
DAILY DOUBLE!!!
All angles less than 180° are obtuse.
FALSE:Only angles between 90° and 180° are obtuse
DAILY DOUBLE!!!
A student says: “A line has 2 endpoints.” What is wrong?
a line has no endpoints
Draw a ray BC
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True or False: Parallel lines will meet if you draw them long enough.
False
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Can two lines be both parallel and perpendicular? Explain.
No, parallel lines never meet, perpendicular lines meet at 90°
DAILY DOUBLE!!!
True or False: A 90° angle is an acute angle.
False. It is a RIGHT angle
DAILY DOUBLE!!!
What is the difference between a line and a line segment?
A line goes on forever; a segment has 2 endpoints.
How many rays are needed to make an angle?
2
Give a real life example of parallel lines.
Train tracks
How many right angles are formed when 2 perpendicular lines meet
4
Draw an obtuse angle.
True or False: A line segment can go on forever.
False
Draw 2 rays that intersect and label them.
DAILY DOUBLE!!!
True or False: Two horizontal lines are always parallel.
False: Only if they stay the same distance apart
DAILY DOUBLE!!!
True or False: Perpendicular lines must always be vertical and horizontal.
False they just need to meet at 90°
DAILY DOUBLE!!!
A student says: “All big-looking angles are obtuse.” Is this always true?
no (it depends on measurement)