Question

exercise 13.1 9th class ncert q 1​

Answer 1

Answer:

here ,l=1.5m, b=1.25m,h=65cm=0.65m

since the box is open at the top,it hasonly five faces .

i) 1.5×25.m^ +2(1.25×0.65+0.65×1.5) m^

1.875+2(1.7875)m^

=(1.875+3.575)m^

=5.45m^

hence,5.45m^of sheet is required.

ii)cost if 1m^ of the sheet =R20

therefore, cost of 5.45m^of the sheet =Rs20×5.45 m^

=Rs109