hitunglah keliling lingkaran jika diketahui jari jari lingkaran 28cm

Rumus lingkaran =

K = 2 × phi × r

jawab :
K = 2 × phi × r
K = 2 × 22/7 × 28 cm
K = 2 × 22 × 4 cm
K = 44 × 4 cm
K = 176 cm

Semoga membantu

Keliling Lingkaran = 2πr
                              = 2 x 22/7 x 28
                              = 2 x 22 x 4
                              = 44 x 4
                              = 176 cm

Semoga Membantu :)