Classifying2D Geometry

Grade 5Geometry

Classify two-dimensional shapes into a hierarchy based on their properties, such as angles, parallel sides, and congruency.

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1Identify 2D Shapes

Learn the names and basic properties of common 2D shapes.

Triangle
Square
Rectangle
Parallelogram
Trapezoid
Circle

2Look at the Properties

Classify shapes by their sides, angles, and special properties.

Number of Sides

3 sides (Triangle)
4 sides (Quadrilateral)
0 straight sides (Circle)

Angles

Right angle = 90°
Acute angle (less than 90°)
Obtuse angle (greater than 90°)

Parallel Sides

2 pairs (Rectangle)
2 pairs (Parallelogram)
At least 1 pair (Trapezoid)

3Classify into a Hierarchy

Some shapes belong to bigger groups.

Quadrilaterals(4 sides)
Square4 equal sides, 4 right angles
Rectangle4 right angles, opposite sides equal
ParallelogramOpposite sides parallel and equal
TrapezoidAt least 1 pair of parallel sides

Every square is a rectangle. Every rectangle is a parallelogram. Using “at least one pair,” every parallelogram is also a trapezoid.

4Real-World Examples

We see 2D shapes in everyday objects!

Triangle
(pizza slice)
Square
(window)
Rectangle
(door)
Parallelogram
(sign)
Trapezoid
(lampshade)
Circle
(clock)

⭐ Try it yourself!

Classify each shape. Write the name of the shape.