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  1. The area of an equilateral triangle is 400√3 sq.m. Its perimeter is :
    1. 120 m
    2. 150 m
    3. 90 m
    4. 135 m
Correct Option: A

Using Rule 6, Area of equilateral triangle

=
√3
 × (side)²
4

=
√3
 × (side)² = 400√3
4

⇒(side)² =
400√3 × 4
√3

⇒ Side = √4 × 400 = 40 metres
∴ Perimeter = 3 × side = 3 × 40 = 120 metres


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