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For cheacking whether these sides togerthere form a right angle triangle then we should use pythogaras therorm
a^{2} +b ^{2} =c ^{2} 
the longest mesure ment is 6.5 so this is our "c" 
therefore c^(2)=6.5*6.5=42.25
the rest two sides are the 'a'and 'b' so =6*6+2.5*2.5
 therefore lhs =rhs th
 there the 6dm,2.5dm and 6.5dm are the sides of a right angle trangle
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