Final Cover - For Printing

Module 89 : Quadrilaterals

QUADRILATERALS

1. Sum of the angles of a quadrilateral is 360^0

Cut a sheet of paper in the form of a quadrilateral. Mark the four angles of the

vertices as A, B, C and D. Cut the quadrilateral into four pieces so that the angles A,

B, C and D get separated into four pieces. Now arrange the four pieces adjacent to

each other to form an angle of 360^0 , revealing the fact that the angle formed in a

quadrilateral is 360^0.

2. Pentagon through knot

Cut a sheet of paper in the form of a strip for a suitable length and width say

30cm×4 cm. Insert one end of the paper into the other to form a knot and gently pull

the paper on both ends so that a pentagon is formed. Now fold the sides so that the

paper strip takes a fine pentagon shape.

A

B

D C

E

A

B

D C

A

B C

D

A + B + C + D = 360 o