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the area of the 1st is
1/2×3×4cm^2
=6cm^2
2nd is
=1/2×3×5cm^2
=7.5cm^2
3rd is
1/2×(4.6)^2
=4.6×2.3cm^2
1/2×3×4cm^2
=6cm^2
2nd is
=1/2×3×5cm^2
=7.5cm^2
3rd is
1/2×(4.6)^2
=4.6×2.3cm^2
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