Discussion
What is the are of an equilateral triangle of side 16 cm?
Answer: D
\[ A = \frac{\sqrt{3}}{4}a^{2} = \frac{\sqrt{3}}{4} \times 16^{2} \]
\[ = \frac{\sqrt{3}}{4} \times 256 = 64\sqrt{3} \text{ cm}^{2} \]
The side is squared, so doubling it would quadruple the area.
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