Tolong di jawab yaa……!!!!

18. (2x+5)+(25)+(3x) =180
5x= 180-5-25
5x = 150
x=30

sudut A =2x+5 =2(30)+5 = 65°
sudut C =3x = 3(30) = 90° (a)

19. Kll persegi panjang = Kll persegi
2(2x-3+x+1) = 4(x+3)
2(3x-2) = 4x+12
6x-4 = 4x+12
6x-4x = 12+4
2x = 16
x= 16/2
x= 8

panjang sisi = x+3=8+3 = 11 cm (a)