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Please, let me answer your question :)
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Persegi :
- S = 36 cm

Segitiga Siku2 :
- a = 36-12 = 24 cm
- t = a > t = 24 cm

Ditanya = L total?

LP = S x S
LP = 36 x 36
LP = 1296 cm²

LSS = ½ x a x t
LSS = ½ x 24 x 24
LSS = 12 x 24
LSS = 288 cm²

L total = 1296 + 288
L total = 1584 cm²

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Hopefully this is the best for you :)

★ Anti Copas-Copas Club ★

Diketahui:
- Sisi persegi = 36cm
- Sebagian sisi bagian kanan persegi = 12cm

Ditanya:
- Alas segitiga = ...?
- Tinggi segitiga = ...?
- Lpersegi + Lsegitiga = ...?

Jawab:
- Lpersegi = s × s
= 36cm × 36cm
= 1.296cm²

- Lsegitiga,
t = 36cm - 12cm
= 24cm

a = t = 24cm(karena segitiga sama kaki)
Maka,
Lsegitiga = 1/2 × a × t
= 1/2 × 24cm × 24cm
= 12cm × 24cm
= 288cm²

Jadi, L = Lpersegi + Lsegitiga
= 1.296cm² + 288cm²
= 1.584cm²
Maaf kalau salah!!
Semoga bermanfaat!!