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b.L = L persegi - L1/4O = s²-1/4πr² = 14² - 1/4 22/7 . 14 .14 = 196-154 = 42 cm²
c.L = 2L persegi - L1/2O = s²-1/4πr² = 2.21² - 1/2 22/7 . 21² = 882-693 = 189 cm²
d.L = L1/2O besar = 1/2.πr² = 1/2 . 3,14 .8.8 = 3,14 . 32 = 100,48 cm³
b.(14 x 14) - (1/4 x 3,14 x 14²) =.....
c.{(21 x 21) - (1/4 x 22/7 x 21²)} x 2 =.....
d.(1/2 x 3,14 x 8²) - (1/2 x 3,14 x 4² )+ (1/2 x 3,14 x 4²)=......