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01-07-2020
Mathematics

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ujalakhan18 ujalakhan18

01-07-2020

Answer:

Option 4

Step-by-step explanation:

=> The length of DE = EF will prove that DEF is an isosceles triangle (having two sides equal)

=> Their slopes being the opposite reciprocals will prove that they are perpendicular to eachother and DEF is a right angled triangle.

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