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Second/Geometry

Classifying Triangles (Multiple Choice)

Identify equilateral, isosceles, scalene, right, acute, and obtuse triangles.
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Practice Questions

  1. Name this triangle by its sides.
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    (B) isosceles

  2. Classify this triangle by its sides.
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    (A) equilateral

  3. Classify this triangle by its sides.
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    (D) scalene

  4. Identify the triangle by its side lengths.
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    (D) scalene

  5. Name this triangle by its sides.
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    (A) equilateral

Quick Tip
Equilateral: 3 equal sides. Isosceles: 2 equal sides. Scalene: 0 equal sides. Right: 1 right angle. Acute: 3 acute angles. Obtuse: 1 obtuse angle.
Teacher Resources
Teaching Notes

This collection focuses on classifying triangles (multiple choice). Use grid paper to help students visualize area and perimeter.

Vocabulary
Equilateral triangle: All three sides are equal.
Isosceles triangle: At least two sides are equal.
Scalene triangle: No sides are equal.
Common Mistakes
  • Confusing Area and Perimeter formulas
  • Forgetting to double the sides for Perimeter
  • Using wrong units (e.g., cm instead of sq cm for Area)
  • Confusing isosceles and equilateral.
  • Misidentifying angle types (acute/obtuse/right).
  • Only classifying by one attribute.
  • Forgetting to classify by both attributes.
Differentiation
SupportHave students trace shapes on grid paper and count squares.
ChallengeChallenge students to find multiple rectangles with the same area but different perimeters.
Discussion Questions
  • What is the difference between Area and Perimeter?
  • Can two rectangles have the same perimeter but different areas?
  • Why do we use 'square' units for area?
  • Can an equilateral triangle also be a right triangle?
  • What is the difference between an acute and an obtuse triangle?
  • How are isosceles and scalene triangles different?
  • Why must every triangle have at least two acute angles?
Extension Activities
  • Measure the classroom floor area.
  • Design a garden with a specific perimeter.
  • Create art using only rectangles of specific areas.
Parent Tip

Find triangles in your home and ask your child to name their type.

Learning Path
Skill Cluster

Geometry & Measurement

Estimated Time

20 minutes

Skills Practiced
Classifying triangles multiple choice