In this document, we take a look back at the basics making up geometry. We learn about the types of angles such as acute and obtuse. We look at actual examples of these angles as well as what makes up adjacent angles. We look at complementary and supplementary angles.
1) Acute angle 4) Straight line angle
- Less than 90o -
- 180o angle
2) Right angle 5) Reflex angle
- 90o angle - More than 180o but less than 360o
3) Obtuse angle 6) RevoluDon
- More than 90o but less than 180o - 360o ( a full circle)
Examples:
1) 4)
2) 5)
3) 6)
Complementary vs Supplementary angles
Complementary
Complementary:
When both angles add up to 90o a
b
Supplementary:
a b
When both angles add up to 180o
Angles are adjacent ( next to each other) when:
supplementary
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