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132 = 2 x 22/7 x r
132 : 2 = 22/7 r
66 = 22/7 r
66 : 22/7 = r
21 = r
a) jari-jari = 21 cm
b) luasnya = π x r²
= 22/7 x 21² = 22/7 x 441 = 1386 cm²
d = 132/ 22/7
d = 132 × 7/22
= 42 cm
Jari jari = 42÷2 = 21 cm
Luas = 22/7 × 21 × 21
= 1386 cm2