Question

Find the cost area of the thin sheeting requried for making an open cistern 5m long 3m wide 4m deep

Answer 1

area of cistern = 2(lb+bh+lh) -lb

=2(5×3 +3×4 +4×5) -15

2(15+12+20) -15

2(47) -15

94-15

=79 cm ^2