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In $\triangle ABC, \angle B = 35^o, \angle C = 65^o$ and the bisector of $\angle BAC$ meets $BC$ in $P$. Arrange $AP, BP$ and $CP$ in descending order.
Given:
In $\triangle ABC, \angle B = 35^o, \angle C = 65^o$ and the bisector of $\angle BAC$ meets $BC$ in $P$.
To do:
We have to arrange $AP, BP$ and $CP$ in descending order.
Solution:
We know that,
Sum of the angles in a triangle is $180^o$.
This implies,
$\angle A + \angle B + \angle C = 180^o$
$\angle A + 35^o + 65^o = 180^o$
$\angle A + 100^o = 180^o$
$\angle A =180^o - 100^o = 80^o$
$PA$ is a bisector of $\angle BAC$
This implies,
$\angle 1 = \angle 2 = \frac{80^o}{2} = 40^o$
In $\triangle ACP$,
$\angle ACP > \angle CAP$
This implies,
$\angle C > \angle 2$
Therefore,
$AP > CP$......…(i)
Similarly,
In $\triangle ABP$,
$\angle BAP > \angle ABP$
This implies,
$\angle 1 > \angle B$
Therefore,
$BP > AP$......…(ii)
From (i) and (ii), we get,
$BP > AP > CP$
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