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jadi jawabannya A
1/4 lingkaran ada 2
1/4 + 1/4 = 2/4
1/2 lingkaran
d = 21 cm
r = 10,5
L = phi × r × r
Karena setengah lingkaran, maka rumusnya
L = 1/2 × phi × r × r
= 1/2 × 22/7 × 10,5 × 10,5
= 1/2 × 22/7 × 110,25
= 1/2 × 22 × 15,75 >>> 110,25 ÷ 7 = 15,75
= 11 × 15,75 >>> 22 ÷ 2 = 11
= 173,25 cm^2
Jadi, jawabannya adalah 'A'
Semoga bermanfaat ^_^
Jadikan jawaban terbaik yaa :D