ICSE Class X Math 2015 Paper

Three vertices of a parallelogram $A B C D$ taken in order are $A(3,6), B(5,10)$ and $C(3$ , 2) find:

Question : 8 of 52

Marks: +1, -0

length of diagonal BD.

Solution:

BD \; = \sqrt{(5-1)^2+(10+2)^2}

\; = \sqrt{16+144}

\; = \sqrt{160}

\; = 4 \sqrt{10} \; \text{ units.} \;

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