SME
Grade 5 Math · Problem type
Classify triangles by sides
Use this for “Which triangle is isosceles?” by its equal sides.
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How many sides are equal?
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Assumptions
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An equilateral triangle has three equal sides. Its three angles are equal too.
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An isosceles triangle has two equal sides. A scalene triangle has no equal sides.
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A right triangle can be isosceles or scalene, never equilateral.
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Some books count an equilateral triangle as isosceles too: it has at least two equal sides.
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