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setengah lingkaran : B2
B1...
diket : panjang = 20cm
lebar = 14cm
ditanya : luas...?
jawab : luas persegi panjang
= panjang × lebar
= 20cm × 14cm
= 280cm²
B2...
diket : diameter = 14cm
jari jari = 7cm
ditanya : luas setengah lingkaran...?
jawab : luas setengah lingkaran
= 1/2 × πr²
= 1/2 × 22/7.7.7
= 1/2 × 22.7
= 1/2 × 154
= 77cm²
luas bangun seluruhnya :
= luas persegi + luas setengah lingkaran
= 280cm² + 77cm²
= 357cm²...
semoga membantu.