If X,Y,Z are respectively the mid points of sides PQ, QR and PR of an equilateral
angle PQR, prove that angle XYZ is also an equilateral triangle.
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Answer:
Given: x,y and z are the mid-point of the sides PQ,QR and RP of ΔPQR,xy and xz are joined.
Prove: XYRZ is a parallelogram.
In PQR,x,y, and z are the mid-point of PQQR and RP respectively.
XY∣∣PR (mid-point theorem)
XY=
2
1
PR (mid-point theorem)
ZR=
2
1
PR (Given)
Therefore, XYRZ is a Parallelogram (One pair of opposite sides parallel and equal)
Hence proved.
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