Triangle DEF is an equilateral triangle with a side length of 12 cm. If point G is the mid point of side DE, what is the length (in cm) of side FG?

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SSC CPO 2024 Official Paper-I (Held On: 27 Jun, 2024 Shift 3)
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  1. 12
  2. 6√3
  3. 6
  4. 3√6

Answer (Detailed Solution Below)

Option 2 : 6√3
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Detailed Solution

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Given:

Triangle DEF is an equilateral triangle with a side length of 12 cm.

Point G is the midpoint of side DE.

Formula Used:

In an equilateral triangle, the length of the median is calculated using the formula:

\(Median = \frac{\sqrt{3}}{2} \times \text{side length}\)

Calculation:

Since G is the midpoint of DE, DG = GE = 6 cm.

In an equilateral triangle, the median also acts as the altitude. Let's calculate FG, where F is the vertex opposite to DE.

Using the median formula:

Median = \(\frac{\sqrt{3}}{2} \times 12\)

⇒ Median = \(\frac{\sqrt{3}}{2} \times 12 = 6\sqrt{3}\)

The length of side FG is 6√3 cm.

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