A B C D is a parallelogram with A B = 6 and A C = 7 , and the perpendicular distance from D to A C is 2.
Find the perpendicular distance from D to A B .
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Let x be the perpendicular distance from D to A B .
Area [ADC] = Area[ACB] = 2 1 ( 2 ) ( 7 ) = 7
Area[ABCD] = 7 + 7 = 14
So we have,
1 4 = 6 x
x = 6 1 4 = 3 7
σ
[
A
D
C
]
=
7
2
⋅
7
;
σ
[
A
B
C
D
]
=
2
⋅
7
=
1
4
=
6
∥
D
F
∥
⟹
∥
D
F
∥
=
6
1
4
=
3
7
.
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The area of triangle A D C is given by 0.5 X base X height = 2 1 × 7 × 2 = 7 .
The area of parallelogram A B C D is twice that of triangle A D C , hence it is equal to 7 × 2 = 1 4 .
The area of parallelogram A B C D is also equal to base X height = 6 × "perpendicular distance from D to A B ". Hence, this distance is equal to 6 1 4 = 3 7 .