Respuesta :
Answer:
15cm
Step-by-step explanation:
side of triangle = 5 cm
perimeter of triangle= 5×3 = 15 cm
Answer:
perimeter = 15 units
Step-by-step explanation:
given Δ ABC with AB = BC = AC , that is the 3 sides of the triangle are congruent (equal )
The triangle is therefore an equilateral triangle
The area ( A) of an equilateral triangle is calculated as
A = [tex]\frac{s^2\sqrt{3} }{4}[/tex] ( s is the length of a side )
given
A = [tex]\frac{25\sqrt{3} }{4}[/tex] = [tex]\frac{s^2\sqrt{3} }{5}[/tex]
Then by comparison of the two expressions for A
s² = 25 ( take square root of both sides )
s = [tex]\sqrt{25}[/tex] = 5
The perimeter is the sum of the 3 sides, then
perimeter = 3 × 5 = 15 units
