Question

the diagonals of a rhombus are 10 cm and 8cm. it's area is

Answer 1

Simply, Multiply the length of the diagonals. In this case, 10 cm x 8 cm x (.5) = 40 cm2

Answer 2

The area of a rhombus= 1/2*product of the diagonals
                                     =1/2*10*8
                                      =40 sq.cm