1. hitunglah keliling dan luas lingkaran dengan jari jari
a) 42cm
b) 20cm
c) 35cm
d) 25cm
a) 42cm
b) 20cm
c) 35cm
d) 25cm
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a. jari jari = 42 cm
K = 2πr
K = 2 × 22/7 × 42
K = 2 × 22 × 6
K = 44 × 6
K = 264 cm
L = πr²
L = 22/7 × 42 × 42
L = 22 × 6 × 42
L = 132 × 42
L = 5.544 cm²
b. jari jari = 20 cm
K = 2πr
K = 2 × 20 × 3,14
K = 2 × 62,8
K = 125,6 cm
L = πr²
L = 3,14 × 20 × 20
L = 62,8 × 20
L = 1.256 cm²
c. jari jari = 35 cm
K = 2πr
K = 2 × 22/7 × 35
K = 2 × 22 × 5
K = 2 × 110
K = 220 cm
L = πr²
L = 22/7 × 35 × 35
L = 22 × 5 × 35
L = 110 × 35
L = 3.850 cm²
d. jari jari = 25 cm
K = 2πr
K = 2 × 3,14 × 25
K = 2 × 78,5
K = 157 cm
L = πr²
L = 3,14 × 25 × 25
L = 78,5 × 25
L = 1.962,5 cm²