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Remember:

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Triangles have three side and three angles. The interior angles in any triangles add up to $180^{\\circ}$.

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An equilateral triangle has three sides that are all the same length, and all three angles are equal.

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An isosceles triangle has two sides that are all the same length, and two angles are equal.

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A scalene triangle has three sides that are all different lengths, and all three angles are different.

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A right-angled triangle has one right-angle. It may be isosceles or scalene, in addition to bein right-angled.

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Questions about the properties of different types of triangles.

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Answer the following.

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3 sides

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Internal angles add up to $180^{\\circ}$

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4 sides

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Internal angles add up to $120^{\\circ}$

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All internal angles are acute angles (less than $90^{\\circ}$)

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All internal angles are the same size

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Which of the following are properties of triangles?

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Three sides of the same length, and three equal angles

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Two sides of the same length, and two equal angles

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One right angle

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Three sides of different lengths, and three angles of different sizes

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What are the properties of an equilateral triangle?

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Three sides of the same length, and three equal angles

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Two sides of the same length, and two equal angles

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One right angle

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Three sides of different lengths, and three angles of different sizes

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What are the properties of an isosceles triangle?

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Three sides of the same length, and three equal angles

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Two sides of the same length, and two equal angles

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One right angle

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Three sides of different lengths, and three angles of different sizes

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What are the properties of a scalene triangle?

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Three sides of the same length, and three equal angles

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Two sides of the same length, and two equal angles

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One right angle

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Three sides of different lengths, and three angles of different sizes

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What are the properties of a right-angled triangle?

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