A rectangular paper of 20 cm x 8 cm is folded 3 times. Each fold is made along the line of symmetry, which is perpendicu...

Question

A rectangular paper of 20 cm x 8 cm is folded 3 times. Each fold is made along the line of symmetry, which is perpendicular to its long edge. The perimeter of the final folded sheet (in cm) is

A. 18
B. 24
C. 20
D. 21

Accepted Answer

18 cm Each fold is made along the midline that is perpendicular to whichever edge is currently the longer one. When the 20 cm length is folded twice it becomes 5 cm, which is now shorter than 8 cm, so the third fold is made perpendicular to the 8 cm (now longer) edge, halving it to 4 cm. The final sheet is 5 cm x 4 cm, giving perimeter 18 cm.

A rectangular paper of 20 cm x 8 cm is folded 3 times. Each fold is made along the line of symmetry, which is perpendicular to its long edge. The perimeter of the final folded sheet (in cm) is A. 18 B. 24 C. 20 D. 21