Berapa cm keliling persegi panjang 2 1/2dm dan 3 2/5dm

2 1/2 dm x 3 2/5 dm
=3,7 dm
=37 cm

Kel. PP = p x l
= 2 1/2 x 3 2/5
= 5/2 x 17/5
= 17/2
= 8 1/2
= 8,5 dm