Unit 7, Lesson 8
Sort Triangles
Grade 5
Warm-up
Estimation Exploration: Angle Measure
What is the measure of Angle A?
Record an estimate that is:
| too low | about right | too high |
|---|---|---|
Student Section Summary
We sorted and analyzed different kinds of quadrilaterals and triangles. We described their properties.
Examples:
- A rectangle is a quadrilateral with 4 right angles.
- A rhombus is a quadrilateral with 4 equal sides.
- A square is a quadrilateral with 4 right angles and 4 equal sides.
- A trapezoid is a quadrilateral with at least 1 pair of opposite sides that are parallel.
- A right triangle is a triangle with a 90-degree angle.
We also described how the shapes are related to each other.
Examples:
- A square is always a rhombus because all squares have 4 equal sides. But a rhombus is not always a square because some rhombuses do not have 4 right angles.
- A square is always a rectangle because it has 4 right angles. But a rectangle is not always a square because some rectangles do not have 4 equal sides.
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