Fifth graders fix shaky polygon definitions before they pile up. You rewrite sentences claiming a hexagon has five sides or that an octagon has ten, then nail down what 'regular' actually means — equal sides AND equal angles, not just one or the other.
Fill-in items lock down vocabulary like heptagon and polygon, plus the 360 degree quadrilateral angle sum. Short answers push you to compare regular versus irregular shapes and explain the (n − 2) × 180 formula using a pentagon. By the end, you stop guessing at shape names and start reasoning from properties — a shift that pays off when geometry gets harder in middle school.
Style:
Classifying 2D Shapes
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
A hexagon has five sides and five angles.
Rewrite: A hexagon has six sides and six angles.
2. Fix the sentence:
A regular polygon has sides of different lengths.
Rewrite: A regular polygon has all sides equal in length and all angles equal in measure.
3. Fix the sentence:
An octagon has ten sides and ten angles.
Rewrite: An octagon has eight sides and eight angles.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A polygon with seven sides is called a heptagon.
2. The sum of interior angles in a triangle is 180° and in a quadrilateral is 360 degrees.
3. A closed plane figure made of straight line segments is called a polygon.
4. A regular hexagon has 6 equal interior angles.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. What is the difference between a regular polygon and an irregular polygon? Give one example of each.
A regular polygon has all sides and all angles equal, like a regular pentagon. An irregular polygon has sides or angles that are not all equal, like a rectangle.
2. How can you find the sum of interior angles of any polygon if you know the number of sides?
You subtract 2 from the number of sides and multiply by 180°. For example, a pentagon has (5 − 2) × 180° = 540°.
Classifying 2D Shapes
★ Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1) Fix the sentence:
A hexagon has five sides and five angles.
Rewrite: A hexagon has six sides and six angles.
2) Fix the sentence:
A regular polygon has sides of different lengths.
Rewrite: A regular polygon has all sides equal in length and all angles equal in measure.
3) Fix the sentence:
An octagon has ten sides and ten angles.
Rewrite: An octagon has eight sides and eight angles.
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) A polygon with seven sides is called a heptagon.
2) The sum of interior angles in a triangle is 180° and in a quadrilateral is 360 degrees.
3) A closed plane figure made of straight line segments is called a polygon.
4) A regular hexagon has 6 equal interior angles.
★ Part C: Short Answer
Answer each question in one or two complete sentences.
1) What is the difference between a regular polygon and an irregular polygon? Give one example of each.
A regular polygon has all sides and all angles equal, like a regular pentagon. An irregular polygon has sides or angles that are not all equal, like a rectangle.
2) How can you find the sum of interior angles of any polygon if you know the number of sides?
You subtract 2 from the number of sides and multiply by 180°. For example, a pentagon has (5 − 2) × 180° = 540°.
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9 Questions
15-20 minutes
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