tolong,pakaicaranya yang bisanya aja,tapi kalo mau semua juga gapapa hehe ^_^ #terima kasih

17.
[tex] \frac{pr}{ \sin3 0 } = \frac{qr}{ \sin120} \\ \frac{5}{ \frac{1}{2} } = \frac{qr}{ \frac{1}{2} \sqrt{3} } \\ 10 = \frac{qr}{ \frac{1}{2} \sqrt{3} } \\ qr = 5 \sqrt{3} [/tex]

20.
[tex] {(x + 3)}^{2} + {(y - 2)}^{2} = {4}^{2} \\ {x}^{2} + 6x + 9 + {y}^{2} - 4y + 4 - 16 = 0 \\ {x}^{2} + {y}^{2} + 6x - 4y - 3 = 0[/tex]