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Answer to Question #17032 in Analytic Geometry for Nijwm

Question #17032
The sides of Quadrilaterals ABCD are AB=6cm, BC=18cm,CD=6cm and DA=10cm. If the restriction is that the diagonal BD must be an integer, how many such Quadrilaterals can be formed?
Expert's answer
Consider the triangle BDA. AB = 6, AD = 10.
According to the triangle rule the triangle BDA can be formed only when |AB - AD| < BD < AB + BD.
So, 4 < BD < 16
Consider the triangle BDC. CB = 18, CD = 6.
According to the triangle rule the triangle BDC can be formed only when |CB - CD| < BD < CB + CD.
So, 12 < BD < 24
Quadrilateral ABCD can be formed when both triangles BDA and BDC can be formed.
So, 12 < BD < 16.
BD must be integer, so BD can be equal to 13, 14 and 15 – 3 different values in total.
So, 3 different Quadrilaterals can be formed.

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