4. In Fig. 6.16, if x + y = w + z, then prove that AOB is a line.
Given that, ..............(i) It is known that, the sum of all the angles at a point = ..............(ii)
From eq (i) and eq (ii), we get
Hence proved AOB is a line.
CBSE Class 10 board exams from February 15 to March 18; download date sheet 2025 PDF
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CBSE Date Sheet 2025 Live: CBSE to announce Class 10, 12 board exam dates soon at cbse.gov.in; sample paper
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