Question

Hitung keliling 3/4 lingkaran jika diket = jari jari 20

Answer 1

3/4 × 3.14 × 20
3 × 3.14 × 5
47,1

maaf kalo salah

Answer 2

K=3/4 x 2 x phi x r(jari jari)
  =3/4 x 2 x 3,14 x 20
  =3/4 x 2 x 62,8
  =3/4 x 125,6
  = 94,2