" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
Luas Karton= 60 × 40
= 2400
luas foto
= (60 - 10) × (40 - 10)
= 50 × 30
= 1500
luas katon yang tidak tertutup karton
2400 - 1500
= 900 cm²