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Verified answer
A. luas persegi panjang = p×L14×20 = 280cm²
d = 14cm maka r = 7cm
luas setengah lingkaran=½πr²
½×22/7×7×7 = 77cm²
luas gabungan= 280+77 = 357cm²
B. luas persegi = s²
28×28 = 784cm²
d = 28cm maka r = 14cm
luas lingkaran = πr²
22/7×14×14 = 616cm²
luas diarsir = 784-616 = 168cm²
Luas = ( 20 × 14 ) + (1/2× πr^2)
= 280 + ( 1/2× 22/7× 7^2)
= 280 + ( 77)
= 357 cm^2
b) Luas = luas bujur sangkar dikurangi luas lingkaran
= (28 × 28 ) - ( πr^2)
= 784 - ( 22/7 × 14^2)
= 784 - 616
= 168 cm^2