tolong y pakai cara no 20-23☺☺☺

20.
QPR = QOR/2
QPR = 74/2
QPR = 37° (B)

21.
[Perbandingan]
AOB/COD = AB/CD
25/100 = 37,5 / CD
1/4 = 37,5 /CD
1/4CD = 37,5
CD = 37,5 ÷ 1/4
CD = 37,5 x 4
CD = 150 cm (A)

22.
AOB/BOC = L. AOB/ L. BOC
30/100 = 36/ L. BOC
3/10 = 36/L.BOC
3L.BOC = 36 . 10
L.BOC = 360/3
L.BOC = 120 cm² (B)

23.
PGSPD = √P​​​​​​​² - (R + r)​​​​​​​²
PGSPD = √169 - (3+2)​​​​​​​²
PGSPD = √169 - 5​​​​​​​²
PGSPD = √169 - 25
PGSPD = √144
PGSPD = 12

Semoga benar dan membantu!