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Verified answer
D = 80 cmr = D/2 = 80 cm : 2 = 40 cm
Luas Juring = 90°/360° x Luas lingkaran
= 1/4 x π x r²
= 1/4 x 3,14 x 40 x 40
= 3,14 x 10 x 40
= 3,14 x 400
= 1.256 cm²
= 0,1256 m²