brapa keliling dri persegi panjang dgn panjang 80cm+10cm

Keliling = 2 (p+l)
            = 2 (80 + 10)
            = 2 x 90
            = 180 cm

rumus =( p + l ) x 2
(80 cm + 10cm) x 2
90 x 2
=180 cm