Page 122 - Touchpad Mathematics_Ver1.0_C4

E:\Working\Orange_Education\TouchPad_Maths_4\Open_Files\Chap_07\Chap_07
\ 10-Nov-2025 Bharat Arora Proof-8 Reader’s Sign _______________________ Date __________

Look around and list any five things where you see angles.

S. No. Name of objects
1 ____________________________

2 ____________________________

3 ____________________________
4 ____________________________

5 ____________________________

Right Angles Century #Experiential Learning
21 st
Let us make a right angle. Skills

Take a piece of paper and fold it as shown in the
picture. You will get a right angle.
Observe your room and find out where you see
right angles. Right Angle

Acute and obtuse Angles

Identify the angles that you think are right angles and circle them in the dot grid given
below. Check using your right angle checker.

b
Tips
d
a
c An angle greater than
a right angle is called
an obtuse angle while
an angle smaller than
a right angle is called
an acute angle.
acute
f g
e h Obtuse

Here, angles b, c, e and h are right angles. Angles a and d are greater than a right
angle. These are called obtuse angles. Angles f and g are smaller than a right angle.
These are called acute angles.

120 Mathematics 4