bantu jawab ya kak pake cara

keliling = 40 + 40 + 17.5 + 17.5 + ( phi x diameter)
            = 80 + 35 + (3.14 x 17.5)
            = 115 + 54,95
            = 169.95 / 170 cm

k=40+40+17,5+17,5=110
=54,95+110
=169,95