Tolong di jawab ya :)
Jawab:
80cm
Penjelasan dengan langkah-langkah:
AB = DC
2x-1 = 15
2x = 15+1
x =16 /2
x = 8
AD = 2x+y+2
= 2(8)+y+2
=16+y+2
=18+y
AD = BC
18+y = 3y+4
18-4 = 3y-y
14 =2y
14/2 =y
7 =y
AD = 18+y
= 18+7
= 25
Keliling jajar genjang = 2AD + 2DC
=2(25)+2(15)
= 50+30
= 80cm
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