Tolong nomor 15 dan 16 PAKAI cara

15)Keliling=π×d
Keliling=22/7×28
Keliling=88 m
Keliling=88×3
Keliling=264 m

16)Volume=1/3×Luas alas×tinggi
=1/3×15×15×9
=675 cm3

15. d = 28 m , r = 1/2 (28) = 14 m
K.lap = 2πr
K.lap = 2 x 22/7 x 14
K.lap = 44 x 2
K.lap = 88 m
Jarak tempuh = 3 x 88 = 264 m

16. s = 15 cm, t = 9 cm
V.limas = 1/3 x s x s x t
V.limas = 1/3 x 15 x 15 x 9
V.limas = 675 cm3