The area of a triangle with sides 11cm, 12cm and 13cm is .....
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Step-by-step explanation:
11+12+13 =36/2cm=18
√18(18-11)(18-12)(18-13)cm^2
=√18×7×6×5cm^2
=√3×2×3×7×2×3×5cm^2
=√2×3×3×7×5cm^2
=680cm^2
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