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Question

Each side of an equilateral triangle measures 8 cm. The area of the triangle is(a) 83 cm2        (b) 163 cm2        (c) 323 cm2        (d) 48 cm2


Solution

semi perimeter =(8+8+8)2 = 12 cm

By Heron' Formula
area =[s(sa)(sb)(sc)] 
        =[12×4×4×4]
        =16√3 cm²
option b is correct


Mathematics
Secondary School Mathematics IX
Standard IX

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