Question

In in a rectangle ABCD if AB= 5 cm and BC=12cm, then find BC.

Answer 1

Answer:

Step-by-step explanation:

AB  =   5 cm

BC  =  12 cm

AC  =  ?

then becuase ABCD is a rectangle so each angle of 90' so

in Right angled triangle ABC

              we know that

          AC^{2}  =  AB^{2}  +  BC^{2}

           AC^{2}  =   5^{2}  +  12^{2}

           AC^{2}    =   25 + 144

            AC^{2}   =   169

             AC       =     √169

             AC       =   13