Hi! I'm Vidi. Let's learn Quadrilaterals together — read with me, then play the games to win a ⭐!
🔵Recognize Quadrilaterals
A quadrilateral is any closed shape with exactly 4 sides and 4 angles.
- Square: 4 equal sides, 4 right angles
- Rectangle: Opposite sides equal, 4 right angles
- Rhombus: 4 equal sides, opposite angles equal (no right angles)
- Trapezoid: Exactly 1 pair of parallel sides
- Parallelogram: 2 pairs of parallel sides, opposite sides equal
👀 See a worked example
Which quadrilateral has 4 equal sides AND 4 right angles?
A square. It is the only quadrilateral with both properties.
Which quadrilateral has exactly one pair of parallel sides?
A trapezoid. It has one pair of parallel sides (the two bases) and one pair that is not parallel.
Which has opposite sides parallel but no right angles?
A parallelogram or rhombus. Opposite sides are parallel and equal, but corners are not 90°.
🤖 Vidi's Key Points
- All quadrilaterals: 4 sides + 4 angles.
- Square and rectangle: 4 right angles. Rhombus: 4 equal sides.
- Trapezoid: 1 pair parallel. Parallelogram: 2 pairs parallel.
🟢A Square is a Special Rectangle
Think of shapes as a family — some shapes belong to more than one group.
- Every rectangle has: 4 right angles + opposite sides equal
- Every square has: 4 right angles + ALL sides equal
Since a square meets all the rules of a rectangle AND has equal sides, every square is a rectangle. But not every rectangle is a square (unless all sides are equal).
👀 See a worked example
Is a square a rectangle?
Yes. A square has 4 right angles and opposite sides equal — it meets all rectangle requirements. Plus all sides are equal.
Is every rectangle a square?
No. A rectangle only needs opposite sides equal. If the sides are not all equal, it is not a square.
Name a shape that is always a square AND always a rectangle.
A square! Every square is a rectangle. But only squares with all sides equal qualify as squares.
🤖 Vidi's Key Points
- Square = rectangle + all sides equal.
- Every square is a rectangle. Not every rectangle is a square.
- A square belongs to: quadrilaterals, parallelograms, rectangles, rhombuses.
🎯 Mission Test
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