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Definition of eo-primes or relatively primes: Two numbers are said to be co-prime or relatively prime If their HCF IS 1 Hence to prove 847 and 2160 as co-prime numbers we will find their HCF and which should be 1 
New steps to find HCF will be as under
2160 = 847 x 2+ 466
847 = 466 ×1 +381
466 = 381 x 1 + 85 
381 =85 x 4+ 41 
85 =41 x 2+3
41 =3 x 13+ 2 
3 =2 x 1+1 
2 =1 x 2+0 
Therefore, the HCF=1 Hence, the numbers are co-primes (relatively prime).
        
             
        
        
        
Salut. BC²=AC²-AB² , BC=√((10)²-(8)²) , BC=√(100-64) , BC=√36 , BC=6cm. J'espere t,avoir aidé