Bantu jawab nomor 18,19 dong :)

Lingkaran

18. <POS = <QOR = 105
<OQR = 50
<PRQ = 180 - 105 - 50 = 25
<POQ = 2 x <PRQ
<POQ = 2(25)= 50°


19. Luas segitiga = 1/2 (alas ) (tinggi)
Luas PQR = 120

Luas PQR = 1/2 (PR)(QT)
120 = 1/2 (PR)(24)
120 = 12PR
PR = 120/12 = 10 cm

QR x PV = PR x QT
QR (20) = 10 x  24
QR = 10 x 24 /(20) = 12 cm

PQ x RU = PR x QT
PQ  x 16 = 10 x24
PQ = (10 x 24)/(16) = 15 cm

Keliling = PR +RQ +PQ = 10 + 12 + 15 = 37 cm