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1 per 8 x 22 per tujuh x 6 x 2 = 4,714
8,642 - 4,714 = 3,928 cm
luas = 45 per 360 x 22 per 7 x 11 x 11= 47,536
1 per 8 x 22 per 7 x 6 x 6 =14,142
47,536-14,142= 33,394 cm kuadrat
b) kel= 1 per 3 x 22 per 7 x 20 x 20= 419,04
mengetahui segitiga nya dengan rumus SOH CAH TOA
jd o(garis OC)per h(hypotenus garis OB) = S(SUDUT)
jd
O = 0,866 (hasil dari sin() x 20
O = 17,32 cm
kemudian pakai rumus phytagoras
jd 10,001 x 17,32 dibagi 2 x 2 =
419,04- 173,2 = 245,84 cm kuadrat