Curriculum
Mathematics — Second Preparatory
Unit 1: Real Numbers
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Unit 2: Algebra
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Unit 3: Geometry
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Congruence
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Congruence — Lesson quiz
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The Pythagorean Theorem
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The Pythagorean Theorem — Lesson quiz
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Applications of Parallelism
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Applications of Parallelism — Lesson quiz
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Medians of a Triangle
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Medians of a Triangle — Lesson quiz
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The Isosceles Triangle
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The Isosceles Triangle — Lesson quiz
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Interior and Exterior Angles of a Polygon
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Interior and Exterior Angles of a Polygon — Lesson quiz
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Unit 4: Statistics
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Text lesson
Interior and Exterior Angles of a Polygon
Interior and Exterior Angles of a Polygon
The exterior angle of a triangle
The exterior angle of a triangle
- An exterior angle of a triangle equals the sum of the two interior angles opposite to it.
- For example, if these two opposite angles are 50° and 60°, the exterior angle is 110°.
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