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= 10 (20 - 10)
= 10 . 10 = 100cm²
1/2. a.t= 1/2. 10. 10= 50 cm2 (A)
9. 1/2. phi. r2= 1/2. 22/7. 14^2=11/7. 196=11. 28=308cm2
kurang 1/2. phi. r2= 1/2. 3, 14. 10^2=1/2. 3, 14. 100=50. 3, 14=157cm2
1/2. phi.r2=1/2. 3, 14. 4^2= 1/2. 3, 14. 16=8. 3, 14= 25, 12cm2
jadi 308-(157+25, 12)=308- 182.12= 125.88.
10. 1/2. a.t=1/2. 6. 22.360679775=67, 08
20^2+10^2=400+100=500
akar dari 500==22.360679775
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