Draw two angles of 90∘ at the ends of a line segment. Extend these rays. Do you get a triangle. Join these 2 rays by another line segment which shape can yo get? What will be the measure of all the angles?
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Solution
Let AB be another line segment
Draw two angles of 90o at the ends of line segment
we get two parallel lines AD and BC ad they dont meet each other Δle cannot be formed
Join C and D with a straight line
ABCD is a quadrilateral
∴ measure of all the angle of a quadrilateral is 360o