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For a triangle to be construct, the sun of two sides of a triangle must be greater than the third side but in this case, sum of two sides- 5cm+5cm = 10cm but not greater than 10cm. So, the triangle cannot be constructed.

Hope you got it?
3 2 3
The basic rule for constructing a triangle is sum of first and second side should be greater than third side.
But 10cm = 10cm Hence it is not greater than 10cm
So triangle cannot be constructed.
1 2 1
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