< pusat = 72 panjang busur PQ = 35 cm Hitunglah = a. jari jari lingkaran b. diameter lingkaran c. luas lingkaran d. luas juring lingkaran
jawab skrng y .
mksh...![]()
jawab skrng y .
mksh...
Jawab:
a. jari² = 27,866 cm
b. Diamter = 55,732 cm
c. Luas lingkaran = 2.438,25 cm²
d. luas juring = 487,65 cm²
Penjelasan dengan langkah-langkah:
Diket: sudut alpha = 72⁰, panjang busur = 35 cm
dit: r = ... cm?; d = ...cm?; L = ... cm?; dan L juring = ... ?
jawab:
panjang busur = sudut alpha / 360⁰ × Kll
35 = 72⁰ / 360⁰ × Kll
35 = 1 / 5 × Kll
Kll = 35 × 5
Kll = 175 cm
2 × π × r = 175
2 × 3,14 × r = 175
6,28 × r = 175
>> r = 27,866 cm
>> d = 2 × r = 27,866 × 2 = 55,732 cm
>> L = π × r² = 3,14 × (27,866)² = 2.438,25 cm²
>> L. Juring = sudut alpha / 360⁰ × L = 72⁰ / 360⁰ × 2.438,25 = 1 / 5 × 2.438,25 = 487,65 cm²
[answer.2.content]
