a. 21cm
b.22/7 × 21 = 22 × 3 = 66
c.22/7 × 10,5 × 10,5
22 × 1,5 × 10,5
33 × 10,5
346,5
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= s√2 = 21√2 cm
b.) Keliling Lingkaran
= 22/7 x 21√2 = 66√2 cm
c.) Luas Lingkaran
= 22/7 x (21√2)² = 22/7 x 882 = 2.772 cm²
a. 21cm
b.22/7 × 21 = 22 × 3 = 66
c.22/7 × 10,5 × 10,5
22 × 1,5 × 10,5
33 × 10,5
346,5