Page 181 - Maths Class 05

Carry On

Count the number of line segments and write their names. Is the number equal to the
number of months in a year ?

__________ __________
B E H
__________ __________
D G
__________ __________
A J
__________ __________

__________ __________
C F I
__________ __________

Angle A

An angle can be defined as the figure formed by two rays
meeting at a common end point. An angle is represented by

the symbol Ð. Here, the given angle is ÐAOB.

Angles are measured in degrees, using a protractor. O
B

Part of an Angle
A
Arms : The two rays joining to form an angle are called arms

of an angle. Here, OA and OB are the arms of the ÐAOB. arm

Vertex : The common end point at which the two rays meet
angle
to form an angle is called the vertex. Here, the point O is the O

vertex of ÐAOB. vertex arm B

We can find angles in various things around us, such as in a pair of scissors, a hockey

stick, a chair.
Angles Around Us

Mathematics-5 181