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Question

The points (a,a), (a,a) and (3a,3a) form the vertices of an


A

Scalene triangle

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B

Right angled triangle

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C

Isosceles Right angled triangle

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D

Equilateral triangle

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Solution

The correct option is D

Equilateral triangle


Let the points be A(a,a), B(a,a), C(3a,3a)

Using distance formula,
BC=(a+3a)2+(a3a)2=22a
AB=(a+a)2+(a+a)2=22a
AC=(a+3a)2+(a3a)2=22a

We got AB=BC=AC=22a

ABC is an equilateral triangle


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