Vocabulary
Crossing
Use a protractor to measure angle A (question 1)
50 degrees
How many minutes are represented by each number on the clock?
5 minutes
What do you call lines that never cross and are always the same distance apart?
Parallel lines
Describe acute and obtuse angles
Acute = less than 90 degrees
Obtuse = greater than 90 degrees
Now that you know angle A is 50 degrees, what is angle B (without using a protractor)?
130 degress
If it's 3:00, what angle do the minute and hour hand make?
90 degrees or right angle
Look at number 3. The degree measurements from a protractor are shown. As you can see, the person did not measure from 0. What is the angle measurement?
68 degrees
110-42=68
Describe perpendicular lines
Lines that intersect and make 90 degree angles
Use a protractor to find the measurement of angle E (question 2). How can you use this answer to find the measurement of angle D (NOT using a protractor?
45 degrees
90-45=45
At 6:00, what type of angle do the hour and minute hand form?
straight angle, 180 degrees
Look at your clocks (or the classroom clock). What is the measurement of the angle between each number. (For example, the angle that is formed between 1 and 2)
30 degrees
Draw a right angle (with a protractor) and label its degree measurement.
90 degrees
Use a protractor to find angle C (question 2). Do the same for angle A.
30 degrees
How many degrees make up a clock?
360 degrees
How many straight angles are in a circle?
2
180 + 180 = 360
What is the name for the point where two rays meet?
A vertex
Write an equation to find the measurement of angle F. What is the measurement?
135 degrees
180 - 45
90 + 45
Dinner started at 6 o'clock. The hour hand changed 30 degrees from the time dinner started to the time dessert was finished. What time did dessert finish?
7:00
How many 45 degree angles are in one circle?
8
45 x 8 = 360