1 Marks Question

Question 11 Mark

What is the type of other angle of a linear pair if. one of its angles is right$?$

Answer

If one angle is right angle, then other angle will also be right angle. As, if we subtract $90^\circ $ from $180^\circ ,$ we get $90^\circ .$

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Question 21 Mark

Write down pair of adjacent angles shown in the following figures:

Answer

Two angles are called adjacent angles, if they have a common vertex and a common arm but no common interior points. Hence, following are adjacent angles:
$a. \angle \text{PQR}, \angle\text{PQT}$
$b. \angle \text{SPR}, \angle\text{RPQ}$
$c. \angle \text{PRQ}, \angle\text{QRU}$

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Question 31 Mark

Write down pair of adjacent angles shown in the following figures:

Answer

Two angles are called adjacent angles, if they have a common vertex and a common arm but no common interior points. Hence, following are adjacent angle:
$a. \angle\text{AOC},\text{AOD}$
$b. \angle\text{AOD},\text{BOD}$
$c. \angle\text{BOD},\text{BOC}$
$d. \angle\text{BOC},\text{AOC}$

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Question 41 Mark

What is the type of other angle of a linear pair if.
one of its angles is obtuse$?$

Answer

If one angle is obtuse angle, then other angle will be acute. As, if we subtract an obtuse angle from $180^\circ ,$ we get an angle which is less than $90^\circ .$

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Question 51 Mark

Write down pair of adjacent angles shown in the following figures:

Answer

Two angles are called adjacent angles, if they have a common vertex and a common arm but no common interior points.
Hence, following are adjacent angle:
$a. \angle \text{TSV}, \angle\text{VSU}$
$b. \angle \text{SVU}, \angle\text{SVT}$

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Question 61 Mark

What is the type of other angle of a linear pair if. one of its angle is acute$?$

Answer

If one angle is acute angle, then other angle will be obtuse. As, if we subtract an acute angle from $180^\circ ,$ we get an angle which is greater than $90^\circ .$

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Question 71 Mark

Write down pair of adjacent angles shown in the following figures:

Answer

Two angles are called adjacent angles, if they have a common vertex and a common arm but no common interior points.
Hence, following are adjacent angles:
$a. \angle \text{AOB}, \angle\text{BOC}$
$b. \angle \text{AOB}, \angle\text{BOD}$
$c. \angle \text{BOC}, \angle\text{COD}$
$d. \angle \text{AOC}, \angle\text{COD}$

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