Draw 2D shapes in free hand with geometry tools.
1. All closed four sided figures are called quadrilaterals
2. It has four sides (AB,BC,CD,DA), four vertices (A,B,C,D) and two diagonals (AC,BD)
Square, Rhombus, Rectangle, Trapezium, Parallelogram
A square has four equal sides (PQ=QR=RS=SP), four vertices (P, Q, R, S) and two diagonals (PR, QS).
The diagonals of a square are equal in length (PR = QS).
Carom board, Chess board, One face of the dice
A rectangle has four sides (WX, XY, YZ, ZW) and four vertices (W, X, Y, Z). It has two equal diagonals (WY = ZX) and opposite sides are equal (WX = YZ ; XY = WZ).
Mat, Black Board
A rhombus has four equal sides (LM = MN = NO = OL), four vertices (L, M, N, O) and two diagonals (LN, MO).
The diagonals are not equal in length.
A Parallelogram has four sides (EF, FG, GH, HE) and four vertices (E, F, G, H). Opposite sides are parallel and equal in length (EF=GH; FG=HE)
Use Geoboard and rubber band to form or deform or reform the different shapes. Discuss similarities and differences among the shapes.