Without using the distance formula, show
that the points A (4, 5), B (1, 2), C (4, 3)
and D (7, 6) are the vertices of a
right angled triangle
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Answer:
Slope of AB
−4−4
4+2
=
−8
6
=
4
−3
Slope of AC
(10−4)
6+2
=
6
8
=
3
4
slope of AB x slope of AC =
4
−3
×
3
4
=−1
Hence, it is Right angle triangle.
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