tolong jawab ini pakai cara ya

Let's me answer your question :)
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Jawaban :
Luas 1/2 lingkaran
= 1/2 π × r²
= 1/2 × 22/7 × 21 cm × 21 cm
= 1/2 × 1386 cm²
= 693 cm²

Luas persegi panjang
= p × l
= 50 cm × 42 cm
= 2100 cm²

Luas bangun
= 2100 cm² - 693 cm²
= 1407 cm²
Opsi B
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Semoga Membantu

Luas bangun
= luas persegi panjang - luas 1/2 lingkaran
= (p x l) - 1/2(πr²)
= (42 cm x 50 cm) - (1/2 x 22/7 x 21 cm x 21 cm)
= 2100 cm² - 693 cm²
= 1407 cm²