Classifying Triangles By Side and Angle

An isosceles triangle has two congruent sides. Which triangle is an isosceles?

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A scalene triangle has no congruent sides. Which triangle is scalene?

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An equilateral triangle has all congruent sides. Which triangle is equilateral?

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What does acute mean?

• 90 degree angle

• less than a 90 degree angle

• greater than a 90 degree angle

What does obtuse mean?

• 90 degree angle

• less than a 90 degree angle

• greater than a 90 degree angle

A polygon is a 2-D shape with closed sides. It can have an unlimited number of sides. Which of these shapes are polygons?

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Which one of these is a right triangle?

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How could you classify this triangle?

• It has a right angle

• It is scalene

• It is a polygon

• It has an obtuse angle

How could you classify this triangle?

• It is an isosceles triangle

• It has a right angle

• It is a polygon

• It has an obtuse angle

Which triangle has all acute angles?

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