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 Exam 2025: Tips, strategies for Class 10 students to ace Physics, Chemistry and Biology
Board Exams Date Sheet 2025 Live: RBSE 10th, 12th exams from March 6; CBSE admit card expected by month-end
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