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360°
40cm² = a° × 3,14 × 10²
360°
40 cm² × 360 = 314 a°
45,86° = a
panjang busur = 45,86 × 3,14 × 20
360
PB = 8,00002 atau 8 cm
a.4cm
b.8cm
c.12cm aku nggak tau caranya
d.14cm
bantuannya memakai cara y