Introduction… | NUST Entrance Test Mathematics

The length of perpendicular from (a,b) to the line y=mx+c is:

Difficulty: Easy

A:

\frac{|am+b+c|}{\sqrt{a^{2}+b^{2}}}

B:

\frac{|ma-b+c|}{\sqrt{m^{2}+1}}

C:

\frac{|am+b+c|}{\sqrt{m^{2}-1}}

D:

\frac{|am-b+c|}{\sqrt{a^{2}+b^{2}}}

The length of perpendicular from (3,1) to the line 4x+3y+20=0 is:

Difficulty: Easy

A:

7

B:

5

C:

11

D:

12

The length of perpendicular from (-2,3) to the line y=2x-3 is:

Difficulty: Easy

A:

5\sqrt{2}

B:

6

C:

2\sqrt{5}

D:

7.5

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