Page 109 - Maths Skill - 3

Geometry 107

Step 3: Place the pencil at point A and join the points A and B. Now remove the ruler.

Thus, a line segment of length A B
13 cm has been drawn. 0 cm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
inch
0 1 2 3 4 5 6
Open and Closed Figures

Open figures are those figures whose ends never meet. They always have two end points.

(a) (b) (c) (d)

All the figures shown above are open figures.

Closed figures are those figures whose ends are joined. They start from one point and
end at the same point.

(a) (b) (c) (d)

All the figures shown above are closed figures.

Exercise 8.2

1. Measure the length of the following line segments using a ruler.

(a) P Q (b) A B (c) X Y
2. Draw line segments of the following lengths in your notebook.

(a) 5 cm (b) 3 cm (c) 9 cm (d) 10 cm
3. Write O for open figures and C for closed figures.

(a) (b) (c) (d)

Plane Shapes and their Properties

Shapes that can be drawn on a flat surface are known as plane shapes. They have no
thickness. They have only length and breadth.

Rectangle

A rectangle has 4 sides, 4 corners and 2 diagonals. Its opposite sides are equal.

Here, ABCD is a rectangle. D C Corner/Vertex

Sides: AB, BC, CD and DA Diagonals

Corners/Vertices (plural of vertex): A, B, C and D A Side B