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72/360 * 22/7 * 14 * 14
1/5 * 22/7 * 196
1/5*616
= 123.2 cm^2
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Pertama ktia cari luas segitiga
AB=18 cm, setengah AB= 9 cm
Cari tinggi = 14^2-9^2= Akar 196-81=
Luas Segitiga= a*t*1/2 = 1/2*18*Akar 115 = cm
Luas Tembereng = 123.2 -9 Akar 115
=
Kalau guru anda ingi jawaban desimalnya, maka
26.686 cm^2 ( 5 s.f.(significant figures))