Perhatikan lingkaran O di samping. Diketahui m<BAD = x + 20, m<BCD = 3x Tentukan sudut BOD saja
Jawaban:
sudut BAD + sudut BCD = 180° (sudut seberang segi4 tali busur)
x+20 + 3x = 180
4x = 160
x = 40°
sudut BAD = x+20
= 40+20
= 60°
sudut BOD minor = 2 × sudut BAD
= 2 × 60
= 120°
sudut BOD mayor = 360 - sudut BOD minor
= 360 - 120
= 240°
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