Question

21. From a cuboidal cardboard box of dimensions
80 cm x 40 cm x 15 cm, 6 circles of radius
7 cm were cut out from the front face. Find the
surface area of the remaining box.
​

Answer 1

Step-by-step explanation:

Let the front face be L × H

so , the surface area of cuboid = 2h(l+b)

=> 2hl +2hb

=> {2hl - 6(πr²) }+ 2hb

=>{ 2(15)(80) - 6[(22/7).(7)²] }+ 2(15)(40)

=> {2400 - 924} + 1200

=> 1476 + 1200

=> 2676 cm² ..