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Luas juring = OPQ / 360° * phi*r²
226,08 = 80° / 360° * 3,14 * r²
226,08 = 6,28 / 9 * r²
6,28r² = 226,08 * 9
6,28r² = 2034,72 / 6,28
r² = 324
r = 18
C. Panjang Busur PQ
=80° / 360° * 2phi * r²
=2 /9 *2 * 3,14 * 18²
= 4069,44 / 9
= 432,16
Maaf yaaa klo salah,,
Semoga membantu ^^ #Terre634