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Course: High school math (India)?>?Unit 3
Lesson 8: Triangles and quadrilaterals- Angles in a triangle sum to 180° proof
- Triangle exterior angle example
- Angle sum property of a triangle
- Triangle inequality theorem
- Triangle inequality
- Triangle congruence postulates/criteria
- Congruent triangles
- Intro to the Pythagorean theorem
- Pythagoras theorem
- Intro to quadrilateral
- Proof: Diagonals of a parallelogram
- Quadrilateral types
- Sum of interior angles of a polygon
- Quadrilaterals
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Quadrilaterals
Problem
The following shapes all belong to the same group.
All of the shapes have equal sides.
Which of the following shapes belongs in the group?