Question

Take four congruent card board (you can use chart paper also) copies of any

quadrilateral ABCD with ∠ 1, ∠ 2, ∠ 3 and ∠ 4. Arrange the copies in such a way that

∠1, ∠ 2, ∠ 3 and ∠ 4 meet at a point, what can you say about the sum of all the four

angles? (Refer page no 40 of NCERT).​

Please answer my question.

Answer 1

Answer:

As we know the sum of all four angles of a quadrilateral is360\degree.

\angle 1,\angle 2,\angle 3,\angle 4 are four angles of quadrilateral ABCD.

Hence, the sum of these angles is 360\degree = \angle 1+\angle 2+\angle 3+\angle 4

Angles ∠1, ∠2, ∠3, ∠4 meet at a point and sum of these angles is 360\degree = \angle 1+\angle 2+\angle 3+\angle 4.