Question

Tentukan keliling lingkarqn yg jari2ny diketahui π=3,14
a.r=5 cm
b.r=10 cm
c.r=15 cm
d.r=20 cm
e.r=25 cm

Answer 1

Luas = 2πr
a.
2π5 = 10π = 10 x 3,14 = 31,4 cm
b.
2π10 = 20π = 20 x 3,14 = 62,8 cm
c.
2π15 = 30π = 30 x 3,14 = 94,2 cm
d.
2π20 = 40π = 40 x 3,14 = 125,6 cm
e.
2π25 = 50π = 50 x 3,14 = 157 cm

Answer 2

Keliling lingkaran A. 2 x 3.14 x 5 B. 2x 3.14 x 10 C. 2 x 3.14 x 15 D. 2 x 3.14 x 20 E. 2 x 3.14 x 25