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25)
< B1 = 180° - < A2
4p = 180° - 108°
4p = 72°
p = 72°/4
p = 18° (C)

26)
Biaya yang diperlukan
= (32 m × 20 m)/(40 cm)^2 × Rp 50.000,00
= 640 m^2/1600 cm^2 × Rp 50.000,00
= 640 m^2/0,16 m^2 × Rp 50.000,00
= Rp 200.000.000,00 (D)

27)
Panjang BD
= V(8^2 + 6^2 + 24^2)
= V(64 + 36 + 576)
= V676
= 26 cm (B)

28)
< A = < P
< B = < Q
< C = < R
AB = PQ
AC = PR
BC = QR

Pasangan sudut yang sama besar adalah
< ABC = < PQR (C)

29)
4/t = 6/(3+6)
4/t = 6/9
4 × 9 = 6 × t
36 = 6t
t = 36/6
t = 6 cm

L = a × t
L = (8 + 4) × 6
L= 12 × 6
L = 72 cm^2 (D)

30)
lf = 20 cm
tf = 30 cm
lk = 20 cm + 2 cm + 2 cm = 24 cm
tk = 30 cm + 2 cm + x cm = 32 cm + x cm

lf/tf = lk/tk
20/30 = 24/(32+x)
20 × (32+x) = 24 × 30
640 + 20x = 720
20x = 720 - 640
20x = 80
x = 80/20
x = 4 cm (C)