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Show that of all line segments drawn from a given point not on it, the perpendicular line segment is the shortest.
To do:
We have to show that of all line segments drawn from a given point not on it, the perpendicular line segment is the shortest.
Solution:
Let us draw a line $l$ and mark a point $P$ on it.
Now let us draw a perpendicular line $AB$ on $l$ and let us point a point $C$ on line $l$ and join $A$ to $C$
Let us now consider $\triangle ABC$,
We have,
$\angle B = 90^o$
We know that,
We know that,
The sum of the interior angles of a triangle is always equal to $180^o$
This implies
In $\triangle ABC,$
$\angle A+\angle B+\angle C = 180^o$
We have,
$\angle B=90^o$
$\angle A+90^o+\angle C = 90^o$
$\angle A+\angle C=180^o-90^o$
$\angle A+\angle C=90^o$
Therefore,
$\angle A$ and $\angle C must be acute angles
This implies,
$\angle A
We know that,
The side opposite to the larger angle is always larger
Therefore,
$AB