please jawab berserta caranya

soal a
s = diameter lingkaran = 14 cm
r = 1/2 d = 7 cm

luas arsiran = luas persegi - luas setengah lingkaran
= (s x s) - (1/2 x πr²)
= (14 x 14) - (1/2 x 22/7 x 7 x 7)
= 196 - 77
= 119 cm²

soal b
s = diameter lingkaran = 10 cm
r = 1/2 d = 5 cm

luas arsiran = luas persegi - luas lingkaran
= (s x s) - (πr²)
= (10 x 10) - (3,14 x 5 x 5)
= 100 - 78,5
= 21,5 cm²