Ade membeli kertas berukuran

Luas kertas = 80× 125=10000 cm 2
Luas layang layang = 1/2 × d1 × d2
=1/2×40×45
= 20×45
=900 cm2
900 cm2 × 8 =7200 cm
Sisa kertas = 10000-7200
=2800