40 poin!
tolong bantuannya segera. menggunakan caranya ya.
terima kasih.
tolong bantuannya segera. menggunakan caranya ya.
terima kasih.
Jawab:
lingkaran
sudut keliling = 1/2 sudut pusat (busur sama)
gambar 1
ΔBPC sama kaki ( BP = PC = jari jari)
<BPC = 180 - 2 x PBC
<BPC = 180 - 2x 78
<BPC = 180 - 156
<BPC = 24
<BAC = 1/2 < BPC
<BAC = 1/2 x 24
<BAC = 12
<APD = 2 x <ACD
<APD = 2 x 18 = 36
<APB = 180 - <APD - < BPC
<APB = 180 - 36 - 24
<APB = 120
gambar 2
<AOB : < BOC = 5 : 4
a) <AOB = 5/9 x 180 = 100
b ) <BOC = 4/9 x 180 = 80
c) < OBC
ΔOBC sama kaki ( OB = OC = jarijari)
<OBC = 1/2 (180 - <BOC)
<OBC = 1/2 (180 - 80)
<OBC = 1/2 (100)
<OBC = 50
d) <ACB = 1/2 x <AOB
<ACB = 1/2 x 100
<ACB = 50