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  1. Chapter 6 Class 7 Triangle and its Properties
  2. Serial order wise
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Ex 6.1, 1 In ∆ PQR, D is the mid-point of QR . (i) PM is _________________. As PM ⊥ QR ∴ PM is altitude of ∆PQR Ex 6.1, 1 In ∆ PQR, D is the mid-point of QR . (ii) PD is _________________. As D is mid point of QR ∴ PD is median of ∆PQR Ex 6.1, 1 In ∆ PQR, D is the mid-point of QR . (iii) Is QM = MR? Here, QD = DR QM + MD = MR − MD QM = MR − MD − MD QM = MR − 2MD AS MD ≠ 0 ∴ QM ≠ MR

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.