Question

Take four congruent card-board OR paper copies of any quadrilateral ABCD,
with angles
as shown [Fig 3.5 (i)]. Arrange the copies as shown in the figure, where angles
∠1, ∠2, ∠3, ∠4 meet at a point [Fig 3.5 (ii)].
Fig 3.4
What can you say about the sum of the angles ∠1, ∠2, ∠3 and ∠4?
[Note: We denote the angles by ∠1, ∠2, ∠3, etc., and their respective measures
by m∠1, m∠2, m∠3, etc.]
The sum of the measures of the four angles of a quadrilateral is___________.
full process in image wull get brillant​

Answer 1

Answer:

Step-by-step explanation:

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.