tolong kerjakan soal nomor 6&8

PSQ = 180 - 90 - 45 = 45

QS / PQ = sin 90 / sin 45
QS = 1 / (1/2 akar 2) × 20
QS = 40 / (akar 2)
QS = 20 akar 2

QR / QS = sin 60 / sin 90
QR = 1/2 akar 3 × 20 akar 2
QR = 10 akar 6