Keliling lingkaran yg berjaring-jqring r=25 cm

[tex]k = 2 \: \pi \: r \\ k = 2 \times 3.14 \times 25 \\ k = 157cm[/tex]
Semoga membantu yaa

keliling lingkaran = pi x 2 x r = 3,14 x 2 x 25 = 157