please tolong dijwb soalnya besok dikumpulin

Penyelesaian :
Luas 1/2 lingkaran
= 1/2×phi×r^2
= 1/2×22/7×7×7
= 77 cm^2
Luas persegi panjang
= p×l
= 20×14
= 280 cm^2
Luas segitiga
= 1/2×a×t
= 1/2×14×10
= 70 cm^2

Total luas gabungan
= 77 cm^2 + 280 cm^2 + 70 cm^2
= 427 cm^2 => C

Semoga membantu ^^