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sudut R=180-54=126
16. luas=d1*d2:2
135=18*d2:2
135=9*d2
d2=135:9=15
17. luas=a+b*t:2
108=a+b*8:2
108=a+b*4
a+b=108:4=27
a=7/9*27=21
b=2/9*27=6
RP=8^2+15^2
RP=64+225=289
√289=17
keliling=21+17+6+8=52
cara no 16 adalah 18 kali 15 dan dibagi 2 hasilnya 135 ( A )