tolong bantu nomor 13 dan 14 nya soalnya besok udah harus dikumpul

Kesebangunan

13.
ABFE sebangun ABCD

EF = [ AB(DE) + DC(AE) ] / [DE + AE]
EF = [ 14(4) + 35(3) ] / [(4) + (3)]
EF = ( 56 + 105)/(7)
EF = 161/7
EF = 23

14.
ΔPQR sebangun Δ PTS
<P = < P
<Q = < T
< R = < S

PQ/PR = PT/PS
(PS + SQ) / (PT + TR) = PT/PS
(9+11) / (12 + TR) = 12/9 ...kalikan silang
12 (12 + TR) = 9 (9+11)
12 (12 + TR) = 9(20)
12 (12+TR) = 180
12 + TR = 180 /12
12 + TR = 15
TR = 3 cm