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Verified answer
Jawaba= sudut pusat
r = 100cm
Panjang busur = 31,4 cm
panjang busur = a/360 x keliling lingkara
31,4 = a/360 x 2 x 3,14 x 100
31,4 = a/360 x 628
a/360 = 31,4/628 = 0,05
a = 0,05 x 360
a = 18°
panjang busur = 31,4
π = 3,14
ditanya : sudut pusat lingkaran?
penyelesaian:
cari keliling nya dulu
K = 2πr
K = 2 . (3,14). 100
K = 628
setelah itu, baru bisa mencari sudut pusat lingkaran. dengan rumus:
Panjang busur/keliling = sudut pusat/360°
31,4/628 = β/360°
β = 31,4/628 dikali 360°
= 18°
semoga benar jawabannya