First slide

Cartesian plane

Question

The points (2, 5), (7, 2), (–1, –2) forms

Easy

A

acute angled scalene
B

obtuse angled scalene
C

right angled scalene
D

equilateral

Solution

$A (2, 5), B (7, 2), C (- 1, - 2)$
$A B = \sqrt{25 + 9} = \sqrt{34}$

$B C = \sqrt{64 + 16} = \sqrt{80}$

$C A = \sqrt{9 + 49} = \sqrt{58}$

$∴ A B^{2} + A C^{2} > B C^{2}$

$∴$ the $Δ^{l e}$ in a acute angled scalene

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