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Construct the following angles and verify by measuring them by a protractor:
(i) $ 75^{\circ} $
(ii) $ 105^{\circ} $
(iii) $ 135^{\circ} $.
To do:
We have to construct the given angles and verify them by measuring them with a protractor.
Solution:
(i)
Steps of construction:
(a) Draw a ray $BC$.
(b) With centre $B$ and a suitable radius, draw an arc meeting $BC$ at $E$.
(c) Cut off arc $EF = FG$ from $E$.
(d) Bisect the arc $FG$ at $K$ and join $BK$ so that $\angle KBC = 90^o$.
Bisect arc $HF$ at $L$ and join $BL$ and produce it to $
Therefore,
$\angle ABC = 75^o$.
(ii)
Steps of construction:
(a) Draw a ray $BC$.
(b) With centre $B$ and a suitable radius draw an arc meeting $BC$ at $E$.
(c) From $E$, cut off arc $EF = FG$ and divide $FG$ at $H$.
(d) Join $BH$ meeting the arc at $K$.
(e) Bisect the arc $KG$ at $L$.
Join $BL$ and produce it to $A$.
Therefore,
$\angle ABC = 105^o$.
(iii)
Steps of construction:
(a) Draw a ray $BC$.
(b) With centre $B$ and a suitable radius, draw an arc meeting $BC$ at $E$.
(c) From $E$, cut off $EF = FG = GH$.
(d) Bisect arc $FG$ at $K$ and join them.
(e) Bisect arc $KH$ at $L$.
(f) Join $BL$ and produce it to $A$
Therefore,
$\angle ABC = 135^o$.
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