Through paper cutting and folding, prove that the sum of all the three angles of a triangle is . STEP 1: Cut two triangles of same size. Mark the angles with compass. STEP 2: Cut the angles of one of the triangles. STEP 3: Draw a line and mark a point P on it. Paste all the angle cut outs at P. Observation: The three angles of the triangle form a straight angle i.e., 1800 . Result: Hence, we have verified that the sum of all the three angles of a triangle is 1800 . Question: Check whether the angles can be the measures of a triangle. a) ∠A = 310 , ∠B = 1280 , ∠C = 220 . b) ∠A = 730 , ∠B = 770 , ∠C = 300 .
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