the given texts. Read the text carefully and the
questions.
Once the mathematics teacher of Class IX-D told students that today we will prove that the
sum of the all the three angles of a triangle is 180º. As shown in the figure, be told to draw any
triangle ABC in the note book. Further side BC was extended to D. After this teacher said to
draw CE || BA. Further angles were named 1 to 5 as shown in the figure.
Solve the following questions
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