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luas juring AST = 16 cm2
luas lingkaran = 4 x 16 = 64 cm2
luas juring RSA = 135 / 360 x 64 = 24 cm2
Keliling lingkaran :
360/90 × 16
4 × 16
64 cm²
Luas juring RAS :
135/360 × 64
3/8 × 64
3 × 8
24
Jadi, luas juring RAS adalah 24 cm².