Remember: Read the mark where the second ray crosses, starting at zero. A right angle is 90 degrees and a straight line is 180 degrees.
Read it carefully
1
The baseline lies along zero. How many degrees is the angle?
2
Read the protractor. How many degrees is this angle?
3
Read the protractor. How many degrees is this angle?
50 degrees130 degrees40 degrees
4
Max says this angle is 40 degrees. What is his mistake?
There is no mistake.He forgot to add the baseline.He counted from the wrong end. The angle starts at zero, so it is 140 degrees.
Use the readings
5
The ray shows how many degrees are already open. How many more degrees make it a right angle?
6
A straight line is 180 degrees. The ray shows how many degrees are open. How many more degrees reach the straight line?
7
Three angles are put side by side. How many degrees in all?
8
A 70 degree angle and a 110 degree angle put side by side make a straight line.
TrueFalse
9
Pip opens a door 50 degrees and then 40 degrees more. The door is now open as a right angle.
TrueFalse
10
Two rays cross the scale at 30 and at 100. How many degrees is the angle between the two rays?
11
Put the angles in order from the smallest to the biggest.
a right angle
a 150 degree angle
a 20 degree angle
a 60 degree angle
12
Draw an angle that measures 70 degrees. Then write whether it is acute, right or obtuse.
13
Write how you know 70 degrees and 110 degrees make a straight line.
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