Page 127 - Math Genius C3

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Square Circle

 ABCD is a square.  A circle is a closed plane figure.
 It has 4 sides: AB, A D  It is made up of only one
BC, CD and DA. Side curved line. O

 It has 4 vertices: Vertex  It has no vertex or side.
A, B, C and D. B C  O, the fixed point inside the circle is
 All sides of a square called the centre of the circle.

are equal in length.  From the centre every point lying on
Here, AB = BC = CD = DA. the circle is at equal distance.

Be Aware
 A square is a rectangle but a rectangle is not a
Fast Check
square.
Name any 3 objects, which are  The longer side of the rectangle is called the length
circular in shape around you. and the shorter side is called the breadth.
_____, ______, ______.  The length and breadth of a square are equal, that
is, the sides of a square are equal.

diaGonals

Look at the given rectangle. Its vertices, A and C are joined with a dotted A D
line. Similarly, vertices B and D are also joined with a dotted line. Line
segments AC and BD are the diagonals of rectangle ABCD.

Thus, a diagonal is a line segment that joins two vertices of a shape that B C
are not next to each other.
A D P S

B Rectangle C Q Square R
The diagonals AC and BD of a The diagonals PR and QS of a square
rectangle are equal in length. are equal in length.

activity Experiential Learning
Read the instructions and join the dots to make the figures.
 Join 8 dots to make a square and colour it yellow.

 Join 10 dots to make a rectangle and colour it red.
 Join 9 dots to make a triangle and colour it blue.
1. Now, draw the diagonals in each shape.
2. In which figure are you unable to draw the diagonal?

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