This Grade 4 worksheet helps students recognize and classify triangles in everyday objects. Learners examine yield signs, pizza slices, and kite shapes, then decide whether each is equilateral, isosceles, or scalene by comparing side lengths. Spelling correction tasks fix grammar errors in classification statements, while fill in the blank items reinforce vocabulary and short answer prompts ask students to spot triangles around them.
Style:
Classifying Triangles
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
A yield sign in Grade 4 has all sides different, so it is a scalene triangle.
Rewrite: A yield sign has all three sides congruent, so it is an equilateral triangle.
2. Fix the sentence:
A thin slice of pizza with two long equal sides is a equilateral triangle.
Rewrite: A thin slice of pizza with two long equal sides is an isosceles triangle.
3. Fix the sentence:
A kite shape with three sides of different lengths is classified as a isosceles triangle.
Rewrite: A kite shape with three sides of different lengths is classified as a scalene triangle.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A traffic yield sign has three congruent sides, so it is an equilateral triangle.
2. A pizza slice with two equal long sides and one shorter side is an isosceles triangle.
3. A triangle with sides 5 cm, 7 cm, and 9 cm is called a scalene triangle.
4. Each angle inside an equilateral triangle measures 60 degrees.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. Look around your classroom for a triangle. Name the object and classify the triangle by its sides.
A music stand bracket forms a triangle with three sides that look the same length, so I would classify it as an equilateral triangle.
2. Why is a yield sign classified as an equilateral triangle and not a scalene triangle?
A yield sign is equilateral because all three of its sides are congruent. A scalene triangle would have three sides of different lengths.
Classifying Triangles
★ Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1) Fix the sentence:
A yield sign in Grade 4 has all sides different, so it is a scalene triangle.
Rewrite: A yield sign has all three sides congruent, so it is an equilateral triangle.
2) Fix the sentence:
A thin slice of pizza with two long equal sides is a equilateral triangle.
Rewrite: A thin slice of pizza with two long equal sides is an isosceles triangle.
3) Fix the sentence:
A kite shape with three sides of different lengths is classified as a isosceles triangle.
Rewrite: A kite shape with three sides of different lengths is classified as a scalene triangle.
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) A traffic yield sign has three congruent sides, so it is an equilateral triangle.
2) A pizza slice with two equal long sides and one shorter side is an isosceles triangle.
3) A triangle with sides 5 cm, 7 cm, and 9 cm is called a scalene triangle.
4) Each angle inside an equilateral triangle measures 60 degrees.
★ Part C: Short Answer
Answer each question in one or two complete sentences.
1) Look around your classroom for a triangle. Name the object and classify the triangle by its sides.
A music stand bracket forms a triangle with three sides that look the same length, so I would classify it as an equilateral triangle.
2) Why is a yield sign classified as an equilateral triangle and not a scalene triangle?
A yield sign is equilateral because all three of its sides are congruent. A scalene triangle would have three sides of different lengths.
Ready to Practice?
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9 Questions
15-20 minutes
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