Classifying Quadrilaterals — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A shape with 4 right angles and opposite sides equal is a rectangle.
Grade 4 students identify rectangles by 4 right angles.
2. A shape with 4 equal sides and 4 right angles is a square.
Grade 4 work shows squares meet both rectangle and rhombus rules.
3. A shape with 4 equal sides but slanted corners is a rhombus.
Grade 4 lessons name 4 equal sides without right angles a rhombus.
4. A shape with 2 pairs of parallel sides and no right angles is a parallelogram.
Grade 4 students recognize a slanted parallelogram by parallel sides.
5. A shape with only one pair of parallel sides is a trapezoid.
Grade 4 work uses the single parallel pair to mark a trapezoid.
6. A square is also a rhombus, so it must have 4 equal sides.
Grade 4 students see the rhombus rule of 4 equal sides applies to squares too.
7. A square is also a rectangle, so it must have 4 right angles.
Grade 4 lessons confirm squares meet the rectangle rule of 4 right angles.
8. Lines that never cross and stay the same distance apart are parallel.
Grade 4 students use parallel lines to classify quadrilaterals.
9. Two lines that meet at a right angle are perpendicular.
Grade 4 work uses perpendicular lines to spot right angles in shapes.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Parallelogram
→ 2 pairs of parallel sides, no right angles needed
2 pairs of parallel sides, no right angles needed
Rectangle
→ Parallelogram with 4 right angles
Parallelogram with 4 right angles
Square
→ Rectangle with 4 equal sides
Rectangle with 4 equal sides
Trapezoid
→ Quadrilateral with one pair of parallel sides
Quadrilateral with one pair of parallel sides
Grade 4 students use defining properties to nest quadrilaterals.