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Of all the line segments drawn from a po...

Of all the line segments drawn from a point P to `a` line `l` not containing P, let PD be the shortest. If B and C are points on `l` such that D is the mid-point of BC, prove that PB = PC.

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MBD-Triangles-Exercise
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  16. Difference of any two sides of a triangle is equal to the third side.

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  18. Sum of the three sides of a triangle is less than the sum of its three...

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  19. Sum of any two sides of a triangle is ........... than the third side.

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  20. If two angles of a triangle are unequal, then smaller angle has the .....

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