Curriculum
Mathematics — First Preparatory
Unit 1: Numbers
0/10
Unit 2: Algebra
0/4
Unit 3: Statistics
0/6
Text lesson
Types of Angles and Their Relations
Types of Angles and Their Relations
Lesson summary
Lesson summary
- An acute angle is less than 90°, a right angle is 90°, an obtuse angle is between 90° and 180°, and a straight angle is 180°.
- Complementary angles add up to 90°, and supplementary angles add up to 180°.
- Vertically opposite angles are equal.
- With parallel lines alternate and corresponding angles are equal, and co-interior angles are supplementary.
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