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= 3,14 × 40² cm
= 3,14 × 1600 cm
= 5024 cm²
b) L.Juring AOB/L● = Sudut AOB/360°
Juring AOB/5024 cm²= 60°/360°
Juring AOB×360° = 60° × 5024 cm²
Juring AOB×360° = 301440 cm
Juring AOB = 301440÷360°
= 837,333 cm²
c) L△ = ½× a× t
= ½× 40 cm × 40 cm
= 800 cm²
d) Maaf kurang tau Letak apotemanya dimana
e) L.Tembereng = L. Juring AOB - L△
= 87,333 cm - 800 cm
= 37,333 cm²