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© T Madas
180
10
20
1700
160
30150
40140
50130
60120
70
110
80
100
90
180
170
160
140
150
13012
0110
100
80
70
60
50
403020100
© T Madas
What is a right angle?
Quarter turn
Right angleHalf turn
Straight line
2 Rig
ht angle
s
Three quarter turn
Full turn
© T Madas
T y p e s o f A n g l e s
Acute angle Right angle Obtuse angle
Straight angle Reflex angle
© T Madas
180
10
20
1700
160
30150
40140
50130
60120
70
110
80
100
90
180
170
160
140
150
13012
0110
100
80
70
60
50
403020100
What do we use for measuring angles?
In what units does it measure angles?
Why does it have a double scale?
ProtractorDegrees, °
© T Madas
180
10
20
1700
160
30150
40140
50130
60120
70
110
80
100
90
180
170
160
140
150
13012
0110
100
80
70
60
50
403020100
What type of angle is it?
Acute angleLess than
90°
40°
© T Madas
What type of angle is it?
Obtuse anglegreater than
90°
120°
180
10
20
1700
160
30150
40140
50130
60120
70
110
80
100
90
180
170
160
140
150
13012
0110
100
80
70
60
50
403020100
© T Madas
© T Madas
Estimate the following angles
36°95° 65°
25° 127° 46°
108°
167°
© T Madas
41° 85° 56°
16°136° 46°
96°
178°
Estimate the following angles
© T Madas
319°275° 304°
344°
225°316°
265°185°
Estimate the following angles
© T Madas
© T Madas
Estimate the following angles
36°95° 65°
25° 127° 46°
108°
167°
© T Madas
41° 85° 56°
16°136° 46°
96°
178°
Estimate the following angles
© T Madas
319°275° 304°
344°
225°316°
265°185°
Estimate the following angles
© T Madas