A rectangle has a width of 12.5 m and a length of 105 m. What is the effect on the perimeter when the dimensions are multiplied by 2?

P=2 (L+W)

when we double each

Pnew=2 (2L+2W)

Pnew=2 (2 (L+W))

Pnew=2 (P)

the perimiter is doubled

if you wanted the actual perimiter

P=2 (L+W)

P=2 (12.5+105)

P=2 (117.5)

P=235 m

double it to get

470m is the doubled perimiter