Published on March 13, 2009
Slide 1: WELCOME TO THE WORLD OF QUADRILATERALS Slide 2: TYPES OF QUADRILATERALS OBJECTIVES: : OBJECTIVES: At the end of the lesson, the students should be able to know the different types of a quadrilaterals and how they relate to one another. QUADRILATERALS : QUADRILATERALS - A quadrilateral is a polygon of four sides. This particular polygon can be classified into parallelograms with opposite sides parallel and trapezoids with exactly two parallel sides. TYPES OF QUADRILATERALS : TYPES OF QUADRILATERALS Trapezoid Quadrilateral Parallelogram Rectangle Square Rhombus TRAPEZOID : TRAPEZOID A trapezoid is a quadrilateral with exactly a pair of parallel sides. K L M N leg leg base base base angles KLMN is a trapezoid. LM is parallel to KN. In symbols, LM KN. The parallel sides of a trapezoid are called bases, and the nonparallel sides are called legs. Slide 7: A B C D If the legs of a trapezoid are congruent, the trapezoid is isosceles. ABCD is an isosceles trapezoid. Slide 8: D E C S If a quadrilateral has no parallel sides, it is called a trapezium. DECS is a trapezium. PARALLELOGRAM : PARALLELOGRAM A Parallelogram is a quadrilateral with two pairs of congruent and parallel sides. C D E F CDEF is a parallelogram. DE ?CF, DE CF DC EF, DC EF ? THREE SPECIAL PARALLELOGRAMS : THREE SPECIAL PARALLELOGRAMS RECTANGLE -A rectangle is parallelogram with four right angles. F G H I FGHI is a rectangle. <F, <G, <H, <I are right angles. RHOMBUS : RHOMBUS - A rhombus is a parallelogram with four congruent sides. P O N M MNOP is a rhombus. MN ? NO ? OP ? PM SQUARE : SQUARE -A square is a parallelogram with four congruent sides and four congruent angles. Q T R S QRST is a square. QR ? RS ? ST ? TQ <Q, <R, <S, <T are right angles. Presented by: RICHARD RAY B. SEGOVIA : Presented by: RICHARD RAY B. SEGOVIA Presented to: Mr. Salvador Salazar Slide 14: Hahaha....