Transcript Document

ANGLES
GRADE 3
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Hello, How are you doing?
Today, we are going to start a new lesson on
Angles.
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Angle
Angle is defined as the figure formed when
two rays or lines meet at the same point.
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Different type of angles
Different type of angles Right angle
 Acute angle
 Obtuse angle
 Straight angle
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Right angle
Right angle – An
angle that forms a
square corner.
Right angle symbol
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Acute angle
Acute angle –An
angle that is less
than right angle.
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Obtuse Angle
Obtuse Angle – An
angle that is
greater than right
angle.
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What is the angle formed at the point A
in the figure given below?
Answer- Right angle
A
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Straight angle
Straight Angle - An
angle formed by a
straight line.
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Important Tip
Perpendicular Lines
always form Right
angle.
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Name the angle formed by a line
segment.
Answer- straight angle
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How many angles greater than 90° are in
the word FAME?
Answer – 2 (in alphabet A)
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Which letter is made up of two right
angles?
a)
b)
c)
d)
W
D
L
T
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Draw the following angles.
a) Right Angle
b) An angle less than 90°
A
B
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ASSESSMENT
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1.
Name the angles greater than 90° in
the figure given below.
Answer – 2 and 4
1
2
3
5
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2.
Name the angles that are 90° in the
figure given in Question No 1.
Answer – 1 and 5
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3. Match the following.
Angle formed by
alphabet V
Right angle
Angle formed when
clock shows 4 O’clock
Acute angle
Angles formed by
alphabet H
Obtuse angle
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4.
Name the angle formed by the
letter L of the English alphabet.
Answer – Right angle
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5.
How many angles are 90° in the
figure given below?
Answer - 2
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6.
Name all the angles formed in the
figure given below.
Answer- acute angle, obtuse angle, right
angle
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7.
Name the angles formed by the
figure given below.
Answer – acute
angle and obtuse
angle
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8.
Name the angle formed when clock
shows 3 O’clock?
Answer- right angle
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9. What kind of angle is formed by
the figure given below?
Answer – acute and
obtuse angle
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10. Decide whether angle is acute,
obtuse or right in the figure
given below.
Answer – obtuse
angle
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Recap
Angles




Acute angle
Obtuse angle
Right angle
Straight angle
Solved examples
Practice problems
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Good Work!
Now Practice worksheets on the lesson.
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