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Question 12 Marks

Padma is facing the toy shop. What place will she face if she takes a half turn clockwise?

What other way can she turn to face the same place?

Answer

Since, Padma is facing toy shop, a half turn clockwise means Padma will face the opposite direction. So, she will now face the Ice Cream cart.
She can also take a half turn anti-clockwise to face the same place i.e., Ice Cream cart.

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Question 22 Marks

Measure each angle in the given shapes. Writ.e the measure of the angles in terms of turns and describe whether they are acute, obtuse or right angles.

Answer

In the given figure, only $F$ shows a turn of less than $\frac{1}{4}$, so angle $F$ is an 4 acute angle and angle $F^{\prime}$ shows a $\frac{1}{4}$ turn, so angle $F^{\prime}$ is a right $F$ angle.

Angle $G$ opens wider than $\frac{1}{4}$ turn but less than a $\frac{1}{2}$ turn, so angle $G$ is an obtuse angle.

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Question 32 Marks

Measure each angle in the given shapes. Writ.e the measure of the angles in terms of turns and describe whether they are acute, obtuse or right angles.

Answer

In the given figure, angles A are B' show turn of less than $\frac{1}{4}$, so they both are acute angles.

Angle $E$ opens wider than $\frac{1}{4}$ turn but less than a half turn, so angle $E$ is an obtuse angle.

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Question 42 Marks

Measure each angle in the given shapes. Writ.e the measure of the angles in terms of turns and describe whether they are acute, obtuse or right angles.

Answer

In the given figure, angles A are B' show turn of less than $\frac{1}{4}$, so they both are acute angles.

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Question 52 Marks

Guess the measure of the turns made by the arrow in the following cases. Verify with a combination of angle measuring tools.

Answer

$\frac{1}{8}+\frac{1}{4}+\frac{1}{16}$ turn
$=\frac{2}{16}+\frac{4}{16}+\frac{1}{16}=\frac{7}{16}$ turn

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Question 62 Marks

Guess the measure of the turns made by the arrow in the following cases. Verify with a combination of angle measuring tools.

Answer

$\frac{1}{8}$ turn

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Question 72 Marks

Guess the measure of the turns made by the arrow in the following cases. Verify with a combination of angle measuring tools.

Answer

$\frac{1}{4}+\frac{1}{4}+\frac{1}{8}$ turn
$=\frac{2}{8}+\frac{2}{8}+\frac{1}{8}=\frac{5}{8}$ turn

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Question 82 Marks

Guess the measure of the turns made by the arrow in the following cases. Verify with a combination of angle measuring tools.

Answer

$\frac{1}{4}+\frac{1}{8}$ turn or $\frac{3}{8}$ turn

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Question 92 Marks

Guess the measures of each of the angles shown below. Then, check using your angle measuring tools. You may need to use a combination of measures. Also, state whether each of the angles is acute, right, or obtuse.

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Question 102 Marks

Make a 5-sided shape with 2 right angles, 2 obtuse angles, and 1 acute angle in your notebook.

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Question 112 Marks

What is the maximum possible turn in each of these cases? Check and tick.

Object	Less than a $\frac{1}{4} \text { turn }$	$\frac{1}{4}$ turn	More than a $\frac{1}{4}$ turn
Clothes clip
Door with hinge
Tongs
Scissors
File cover

Answer

Object	Less than a $\frac{1}{4} \text { turn }$	$\frac{1}{4}$ turn	More than a $\frac{1}{4}$ turn
Clothes clip	✔
Door with hinge			✔
Tongs		✔
Scissors		✔
File cover			✔

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Question 122 Marks

What angle have you made with a $\frac{4}{8}$ turn?

Answer

Turn the straw by four $\frac{1}{8}$ parts of the circle clockwise or anticlockwise.

So, the angle made with a $\frac{4}{8}$ turn is a straight angle.

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Question 132 Marks

What angle have you made with a $\frac{2}{8}$ turn? A $\frac{1}{8}$ turn is half of a quarter turn.

Answer

Angle made with a $\frac{2}{8}$ turn is a right angle.
Since, two $\frac{1}{8}$ make a $\frac{1}{4}$. So, a $\frac{1}{8}$ turn is half of a quarter turn.

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Question 142 Marks

Turn the straw by three parts of the circle clockwise or anti-clockwise.

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Question 152 Marks

Since two $\frac{1}{8}$ makes a $\frac{1}{4}$, turn the straw by two parts of the circle clockwise or anti-clockwise.

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Question 162 Marks

Turn the straw by two $\frac{1}{8}$ part of the circle clockwise or anticlockwise.

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Question 172 Marks

Show a $\frac{1}{8}$ turn of the straw.