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Cut the outline of it

Now cut the angles of it

Arrange them in a straight line

Then it forms 180°

Solution

Given,ABC=90°, BCA=45°

To prove, ABC +BCA+ CAB= 180°

Proof, In Triangle ABC

ABC+BCA+CAB=180°

Therefore, 90' + 45' + CAB = 180'

THEREFORE, CAB=45'

Therefore, 90'+45'+45'=180'

Hence Proved..