First slide

Cartesian plane

Question

If the coordinates of the mid-points of side AB and of $△ A B C$ are $D (3, 5)$ and $E (- 3, - 3)$ respectively, the BC=

Easy

A

10
B

15
C

20
D

30

Solution

We have,
$B C = 2 D E = 2 \sqrt{(3 + 3)^{2} + (5 + 3)^{2}} = 20$

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