D=42cm R=?cm L=?cm Soal ke 2 D=36cm R=?cm L=?cm

Bab Lingkaran
Sekolah Dasar Kelas V

1. r = 1/2 × d
r = 1/2 × 42
r = 21 cm

L = phi × r × r
= 22/7 × 21 × 21
= 22 × 3 × 21
= 1386 cm2

2. r = 1/2 × d
= 1/2 × 36
= 18 cm

L = phi × r × r
= 3,14 × 18 × 18
= 1017,36 cm2