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Explicação passo a passo:
BM/AM = BC/AD
19/8 = 34/AD
em cruz
19 * AD = 8 * 34
19AD =272
AD = 272/19 =14,3 >>>>>
AB/25 =34/14,3
14,3 AB = 25 * 34
14,3 AB =850
AB = 850/14,3 =59,4 >>>>>
19/MD =AB/25
19/MD = 59,4/25
59,4MD = 25 * 19
59,4MD =475
MD = 475/59,4
MD =7,99 >>>>>
AM/MC=BM/MD
8/MC = 19/7,99
19 * MC = 8 * 7,99
19MC =63,92
MC = 63,92/19=3,36 >>>>>
AB = 59,4 >>>
MD = 7,99 >>>
BC = 34 >>>
BD = BM + MD = 19 + 7,99 = 26,99 >>>>
b
SM/MT = AU/ST
9/12= 20/ST
9 * ST= 12 * 20
9ST = 240
ST = 240/9 =26,7 >>>>
SM/MT = RM/MT
9/12 = RM/12
12 * RM = 9 * 12
12RM = 108
RM = 108/12 =9 >>>>>
RM/MT = MU/MS
9/12 = MU/9
12 * MU = 9 * 9
12MU = 81
MU = 81/12 =
MU = 6,75 >>>>
RS/TU =SM/MT
RS/17 =9/12
12 * RS = 17 * 9
12RS = 153
RS = 153/12 = 12,75 >>>>
RS = 12,75
ST = 26,7
RM = 9
US = =MU + SM =6,75 + 9 = 15,75 >>>