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Question
If ABC is an equilateral triangle and P, Q, R respectively denote the middle points of AB, BC, CA then
Options:
A .  PQR must be an equilateral triangle
B .  PQ + QR = PQR + AB
C .  PQ + QR = PR + 2AB
D .  PQR must be a right angled
Answer: Option A
According to question,
Given : P, Q and R are the mid points of AB, BC and AC
PQ || AC and PQ = $$\frac{1}{2}$$ AC
PR || BC and PR = $$\frac{1}{2}$$ BC
RQ || AB and RQ = $$\frac{1}{2}$$ AB
              (mid point theorem)
∴ ΔPQR is an equilateral triangle

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