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Published byCecilia Young Modified over 9 years ago
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The sum of the angles of a triangle is always 180 degrees.
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We classify triangles according to the measure of the angles of the triangle.
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All 3 angles measure less than 90 degrees.
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One angle measures 90 degrees and the other two angles are acute.
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One angle that measures more than 90 degrees and the other two are acute.
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We classify triangles according to the length of the sides of the triangles.
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The lengths of the sides are not congruent. The lengths are not equal in size.
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The lengths of two sides are congruent.
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The lengths of all three sides are equal in size which means they are congruent.
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Congruent triangles are triangles that are equal in size and shape. They have the same length of the sides and have the same measure of the angles.
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Side Angle Side
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Side Side Side
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Angle Side Angle
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Polygons A polygon is a many sided closed figure.
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POLYGONS Triangle-3 sided Quadrilateral-4 sided Pentagon-5 sided Hexagon-6 sided
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Polygons Heptagon--7sided Octagon--8 sided Nonagon--9 sided Decagon--10 sided
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Polygons Undecagon--11 sided Dodecagon--12 sided **A regular polygon has equal sides.**
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All sides are congruent. Opposite sides are parallel. 4 Right Angles.
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Opposite sides are congruent and parallel. 4 Right Angles.
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Opposite sides are congruent and parallel.
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Opposite sides are parallel. All sides are congruent.
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Has 2 parallel lines.
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