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Verified answer
Luas 1 = Luas setengah lingkaran besar= π . 21² / 2
= 22/7 . 21² / 2
= 693
Luas 2 = luas setengan lingkaran a
= π . 14² / 2
= 22/7 . 14² / 2
= 11/7 . 14 . 14
= 22 . 14
= 308
Luas 3 = luas setengah lingkaran b
= π . 7² / 2
= 22/7 . 7² / 2
= 11/7 . 7 . 7
= 77
Luas daerah yang di arsir
= L1 - L2 - L3
= 693 - 308 - 77
= 385 - 77
= 308