Answer:
18√3 cm
or
≈ 31.17 cm
Explanation:
Find the perimeter of an equilateral if the altitude has length 9 cm .
the perimeter of an equilateral triangle having only the height is found with the formula Perimeter = h × 2√3
9 × 2√3 =
18√3
or
9 × 2√3 =
18√3 =
18 × 1.732050807568877 =
≈ 31.17 cm