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1. lingkaran berjari-jari 7 cm
2 setengah lingkaran berjari- jari 14 cm
untuk bangun 1
= phi x r^2
= 22/7 x (7^2)
= 154 cm2
untuk bangun 2
= phi x r^2 : 2
= 22/7 x (14^2) : 2
= 616 : 2
= 308 cm2
jadi luas keseluruhan = 154 + 308 = 462 cm2