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90 = 3× - 15 + 2x + 5
90 = 5× - 10
5× = 90 + 10
5× = 100
× = 20°
sudut BOC
= 2× + 5
= 2(20) + 5
= 45° (C)
28. a. garis bagi
30.
garis singgung persekutuan luar
= r lingkaran besar - r lingkaran kecil
= 12 - 7
= 5
garis singgung persekutian luar
= \/ 13^2 - 5^2
= \/ 169 - 25
= \/ 144
= 12 cm (C)
= 80
Busur BC = <BOC / 360 x keliling
= 80/360 x 72
= 8/36 x 72
= 16 cm