Question

∆PQR is an equilateral
triangle. If PQ = 10 cm,
find the area of ∆ PQR using Heron's formula.
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Answer 1

Answer:

s

$= (3 \times 10 ) \div 2 \\ = 15 \\ a = \sqrt{10(15 - 10)(15 - 10)(15 - 10) } \\ = \sqrt{10 \times 5 \times 5 \times 5} \\ = \sqrt{1250} \\ = 35.3553390593$