Part One
Lesson 1 – Geometrical Figures
Q) Collect some pictures in which you can see angles. Mark those angles using a pencil.
Ans: The angles are marked in pink.
Q) Look at the angles that can be made at your elbow.
Ans:
Observe the figures below and write “right angle”, “acute angle” or “obtuse angle” in the box below each figure.
Ans:
Make right angles by joining the dots in the box below.
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Make acute angles by joining the dots.
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Make obtuse angles by joining the dots.
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Make a right angle, acute angle and obtuse angle at your elbow. Show these angles to your friends and check theirs.
Ans: Students must do this on their own.
Check! Is this true?
The angle an electric pole makes with the ground is a right angle.
Ans: True
The slide makes one acute angle and one obtuse angle with the ground.
Ans: True
The ladder makes one acute angle and one obtuse angle with the wall.
Ans: True
The angle between the thorns of the babul tree is an obtuse angle.
Ans: True
Leaving the thumb, the angles between any two adjoining fingers is an acute angle.
Ans: True
Look at each circle. Is the line shown by the arrow a chord, a diameter or a radius of the circle? Write it in the box below.
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Observe the figures and complete the table below.
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Look at the figures and complete the table below.
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