tolong dong yng d buletin nomer nya

12. PQ^2 = OP^2 - OQ^2
PQ^2 = 13^2 - 5^2
PQ^2 = 169 - 25
PQ. = √144
PQ. = 12
D. 12 cm

13. SR = OS + OR
12 = 6 + 6
Pythagoras1
PS^2 = PR^2 - SR^2
PS^2 = 13^2 - 12^2
PS^2 = 169 - 144
PS. = √25
PS. = 5 cm

Pythagoras2
SQ^2 = RQ^2 - RS^2
SQ^2 = 20^2 - 12^2
SQ^2 = 400 - 144
SQ. = √256
SQ. = 16 cm

PQ = PS + SQ
21 = 5 + 16
C. 21 cm

nomor 14 ada yang ketutupan, jadinya soalnya gajelas, maaf^^

Semoga bermanfaat, tolong koreksi ^^