kak dijawab pakai carayaaaa plase.....

45.) Kell. = 2(p+l)
72 = 2(p+p-8)
72 = 2(2p-8)
72 = 4p-16
4p = 72+16
4p = 88
p = 22
l = p-8
= 22-8
= 14
Luas= pxl
= 22x14
= 308 cm²

46.) Kell. = 2(s1+s2)
66 = 2(3s+8s)
66 = 2(11s)
66 = 22s
s = 3cm
Sisi pendek
= 3s
= 3.3
= 9cm
Sisi panjang
= 8s
= 8.3
= 24cm

47.) Kell. = a+b+c
19 = 2x-1+x+3+3x-1
19 = 6x+1
6x = 18
x = 3 cm

48.) 3x-5+95+x-10= 180
4x+80 = 180
4x = 100
x = 25
ΔBAC= 3x-5
= 3(25)-5
=75-5
=70°