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Make a triangle on a cardboard
Cut the outline of it
Now cut the angles of it
Arrange them in a straight line
Then it forms 180°
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It is a property i.e. Angle Sum Property This means all the angles of a triangle are equal.
Given,ABC=90°, BCA=45°
To prove, ABC +BCA+ CAB= 180°
Proof, In Triangle ABC
Therefore, 90' + 45' + CAB = 180'
Therefore, 90'+45'+45'=180'
Hence Proved..
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