Class : Basic 6
Subject : Mathematics
Topic Types of Angles
Two Angles are Complementary when they add up to 90 degrees (a Right Angle).
They don’t have to be next to each other, just so long as the total is 90 degrees.
• 60° and 30° are complementary angles.
• 5° and 85° are complementary angles.
Two Angles are
Supplementary when they add up to 180 degrees.supplementary angles 40 and 140
These two angles (140° and 40°) are Supplementary Angles, because they add up to 180°:
Notice that together they make a straight angle. supplementary angles 60 and 120But the angles don’t have to be together.
These two are supplementary because60° + 120° = 180°
An angle whose measure is less than 90 degrees.
angle whose measure is 90 degrees.
An angle whose measure is bigger than 90 degrees but less than 180 degrees. Thus, it is between 90 degrees and 180 degrees.
An angle whose measure is 180 degrees.Thus, a straight angle look like a straight line.
An angle whose measure is bigger than 180 degrees but less than 360 degrees.
- Classify the following angles into acute, obtuse, right and reflex angle:
.(2) Identify which of the following pairs of angles are complementary or supplementary?
(i) 70°, 20°
(ii) 20°, 170°
(iii) 50°, 145°
(iv) 125°, 55°
(v) 105°, 75°
(vi) 55°, 35°
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