Question

Find the cost of levelling a ground in the form of a triangle with sides are 40 cm 70 cm and 90 cm at rupees 44 square m (√5=2.25)

Answer 1

perimeter of triangle = 40+90+70=200cm or 2 m

semi perimeter =perimeter/2=2/2=1m

all sides in meter=0.4,0.7,0.9

heron’s formula

[(1-0.4)(1-0.7)(1-0.7)(1)]^1/2

after solving

3/10 X1/(5)^1/2   -1

we are given value of (5)^1/2=2.25

puttuing value of given in 1

we get 2/15 square meter as area

now cost =2/15X44

solve this and you get your answer