Page 126 - Math Genius C3

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Step 2: Mark two points, say P and Q, P Q

against the marks 0 and 3 on the 0 cm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
ruler. 0 1 2 3 4 5 6

Step 3: Holding the ruler firmly, join these
two points P and Q with a pencil. P Q
The line segment PQ thus drawn is 0 cm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

the required line segment of 3 cm 0 1 2 3 4 5 6
in length.

practice time 7B

1. Measure the line segments using a ruler and fill in the blanks.

(a) X Y XY = ________ cm

(b) P Q PQ = ________ cm

(c) A B AB = ________ cm

(d) R S RS = _________ cm
2. Draw line segments using a ruler.

(a) 2 cm (b) 7 cm (c) 10 cm (d) 11 cm

plane shapes

Any closed figure joining three or more points that can be drawn on a flat surface is called
a plane figure or shape. Triangles, rectangles and squares are plane shapes. These shapes

are also called 2-dimensional shapes because they have length and breadth.

Triangle A Vertex Rectangle A Vertex D

 ABC is a triangle.  ABCD is a rectangle.
Side
 It has 3 sides:  It has 4 sides:
AB, BC and CA. AB, BC, CD and DA
B C B Side C
 It has 3 vertices:  It has 4 vertices:
A, B and C. A, B, C and D.

 A triangle is denoted by the symbol  The lengths of the opposite
D. So, triangle ABC can be written as sides of a rectangle are equal.

DABC. Here, AB = CD and BC = AD.

124 Mathematics-3