the main area formula is A= 5x s x r/ 2 where s is a side r is the radius, r can be found as following r is the hypothenuse, so tanα=a/S, where S=s/2=7 tanα=22/7=Pi, so α=arctanPi= 72.3° for finding r, r = a/sin α=22/sin 72.3°=23 so finally the area is A= (5x 14x 23 )/2=808
