Tolong bantu jawab dong pliss
Jawaban:
a). jari jari lingkaran 10 cm, jika π = 3,14
•Keliling lingkaran :
K = 2πr
K = 2 × 3,14 × 10
K = 62,8 cm
•Luas lingkaran :
L = πr²
L = 3,14 × 10²
L = 3,14 × 100
L = 314 cm²
b). Jari jari lingkaran 21 cm, jika π = 22/7
•Keliling lingkaran :
K = 2πr
K = 2 × 22/7 × 21
K = 44 × 3
K = 132 cm
•Luas lingkaran :
L = πr²
L = 22/7 × 21²
L = 22/7 × 441
L = 22 × 63
L = 1.386 cm²