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Download Compare and Contrast Polygons Unit 4, Lesson 3
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Transcript
Warm Up • Brooks and Jackson were constructing quadrilaterals (squares, rhombi, rectangles, parallelograms, trapezoids) on drawing paper and decided to include diagonals in each of their shapes. After they were finished their mom asked them to color the shapes that had diagonals that were all congruent to each other. Which polygons should the boys have colored? Constructing Polygons Alignment Lesson Perpendicular lines intersect or meet to form right angles Parallel lines always are the same distance apart and never touch Equilateral triangle An equilateral triangle has all congruent sides Isosceles triangle An isosceles triangle has all at least two congruent sides What are ways to classify triangles? Scalene Classify by the length of their sides Isosceles Equilateral Triangles Acute Classify by the measure of the angles Right Obtuse Vocabulary Review • Quadrilateral - a polygon with four sides Vocabulary Review • Parallelogram - a polygon with two pairs of parallel sides • A rectangle is a parallelogram • A rhombus is a parallelogram • A square is a parallelogram Vocabulary Review • Square - a parallelogram with all sides the same length and all right angles – Diagonals are congruent – Diagonals are perpendicular – A quadrilateral Vocabulary Review • Rectangle - a parallelogram with all right angles – Diagonals are congruent – Opposite sides are congruent Vocabulary Review • Rhombus - a parallelogram with all sides the same length • Diagonals are NOT congruent • Diagonals are perpendicular Vocabulary Review • Trapezoid – a quadrilateral with ONLY one pair of parallel sides • Right trapezoid - a trapezoid with right angles Vocabulary Review • Pentagon - a polygon with five sides Vocabulary Review • Hexagon - a polygon with six sides Vocabulary Review • Octagon – a polygon with eight sides Vocabulary Review • Kite - A quadrilateral with two distinct pairs of congruent, adjacent sides and diagonals that intersect at a right angle. Geoboards (interactive geoboard) • Construct a polygon that has “3 sides with 2 sides equal” on your geoboards • What is the correct geometry term to describe our triangles? • Find Day 43, “Constructing Polygons Set A” (pages 1 and 2). • Find Day 43, “Geoboard Paper” • Independently create each polygon. • After creating, draw each polygon on “Geoboard Paper,” and compare your shape with your partner’s and record similarities and differences between the two shapes they constructed. • Lastly, record a name for the polygon they have drawn. Geoboards • Math Talk!! Let’s discuss the polygons you constructed. • Now let’s try “Constructing Polygons Set B” Homework Day 43, “Constructing Polygons Homework”