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equilateral triangle isosceles triangle right triangle obtuse triangle acute triangle scalene triangle square rectangle parallelogram rhombus trapezoid Triangles – Polygons with three sides Quadrilaterals – Polygons with four sides vertex side • Polygons are plane figures (flat shapes) with three or more sides. • A polygon is made by joining line segments. Each line segment is a side. • A vertex is the point where the sides meet. Polygon equilateral triangle isosceles triangle right triangle obtuse triangle acute triangle scalene triangle square rectangle parallelogram rhombus trapezoid © Copyright NewPath Learning. All Rights Reserved. 93-4405 www.newpathlearning.com Polygons All three sides have equal length One of the angles is a right angle (90º) All three angles are acute angles (less than a right angle) One of the angles is an obtuse angle (greater than a right angle) At least two sides have equal length A four-sided polygon with two pairs of parallel sides Four sides of equal length and four right angles A four-sided polygon with four right angles A four-sided polygon with one pair of parallel sides Opposite sides are parallel and all four sides have equal length All three sides have different lengths

\|xiBAHBDy01659lz[ Key Vocabulary Terms • acute triangle • rectangle • equilateral triangle • rhombus • isosceles triangle • right triangle • line segment • scalene triangle • obtuse triangle • side • parallelogram • square • plain figure • trapezoid • polygon • triangle • quadrilateral • vertex Triangles – Polygons with three sides Quadrilaterals – Polygons with four sides • Polygons are (flat shapes) with three or more sides. • A polygon is made by joining . Each line segment is a . • A is the point where the sides meet. © Copyright NewPath Learning. All Rights Reserved. 93-4405 www.newpathlearning.com Polygons All three sides have length One of the angles is a angle (90º) All three angles are angles (less than a right angle) One of the angles is an angle (greater than a right angle) At least two sides have length A four-sided polygon with two pairs of sides Four sides of length and four angles A four-sided polygon with four angles A four-sided polygon with one pair of sides Opposite sides are and all four sides have length All three sides have lengths