Answer:
By tripling the base length.
Step-by-step explanation:
The surface area of a regular triangular pyramid is:
[tex]S = \frac{3\cdot b\cdot l}{2} + \frac{b\cdot h}{2}[/tex]
[tex]S = \frac{b}{2}\cdot \left(3\cdot l + h)[/tex]
By tripling the base length, the surface area of the regular triangular pyramid is tripled.
