Area Of Triangle = Square Root Of (S(S-A)(S-B)(S-C))
Now S = 5+12+13/2 = 15
Now Simply
Area = Square Root Of (15*10*3*2)
Area = Square Root Of (900)
Area = 30
Now Area Of Triangle = 1/2*Base*Height
Now Base = 13
Now
1/2*13*Height = 30
13*Height = 60
Height = 60/13 = 4.61 cm