Question

if two legs of a right angle containing right angle are 4 cm and 10 cm find the area of the rectangle

Answer 1

area = 1/2 x height x base [Here the height and base are the legs]
        = 1/2 x 4 x 10
        = 20 sq.cm

Answer 2

1/2*4*10=2*10=20cm^2