Please help me Friend hehehe

Luas Persegi Panjang :
L = p × l
L = 30 × 20
L = 600 cm²

Luas Setengah Lingkaran :
L = ½ × ¼πd²
L = ½ × ¼ × 3,14 × 20 × 20
L = ½ × 3,14 × 5 × 20
L = ½ × 3,14 × 100
L = ½ × 314
L = 157 cm²

Luas Gabungan :
L = 600 cm² + 157 cm²
L = 757 cm²

Maaf Kalau Salah