Jawab:

1. 9.288 cm^2

2. 11.460 cm^2

3. 640 cm^2

4. 6.294 cm^2

5. 18.430 cm^2

Penjelasan dengan langkah-langkah:

1.
P = 45 cm
L = 12 cm
T = 72 cm

Rumus =  2 × (pl + lt + pt)

LP = 2 (45 x 12 + 12 x 72 + 45 x 72)
LP = 2 (540 + 864 + 3.240)
LP = 2 (4.644)
LP = 9.288 cm^2

2.
P = 43 cm
L = 10 cm
T = 100 cm

LP = 2 × (pl + lt + pt)
LP = 2 (43 x 10 + 10 x 100 + 43 x 100)
LP = 2 (430 + 1.000 + 4.300)
LP = 2 (5.730)
LP = 11.460 cm^2

3.
P = 12 cm
L = 17 cm
T = 4 cm

LP = 2 × (pl + lt + pt)
LP = 2(12 x 17 + 17 x 4 + 12 x 4)
LP = 2(204 + 68 + 48)
LP = 2(320)
LP = 640 cm^2

4.
P = 32 cm
L = 11 cm
T = 65 cm

LP = 2 × (pl + lt + pt)
LP = 2(32 x 11 + 11 x 65 + 32 x 65)
LP = 2(352 + 715 + 2.080)
LP = 2(3.147)
LP = 6.294 cm^2

5.
P = 55 cm
L = 13 cm
T = 125 cm

LP = 2 × (pl + lt + pt)
LP = 2(55 x 13 + 13 x 125 + 55 x 125)
LP = 2(715 + 1.625 + 6.875)
LP = 2(9.215)
LP = 18.430 cm^2

(Maaf jika salah)