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Q: What is the perimeter of an equilateral triangle that had a base side of the 5inches?

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The base is one third of the perimeter, half of the base times the height is the area.

4 inches x 3 sides = 12 inches for the perimeter.

it is a equilateral triangle and 3cm each side base times high divided by 2 so........... 3x3=9 divided by 2= 4.5 cm

It will be either isosceles or equilateral. It is equilateral if all of the angles are congruent.

An equilateral triangle with a height of 20 has a base of 23.1 (23.09401), not 15. If the base is 15 then the height will be 13 (12.99038).

No. It need not be the base angles that are equal, it can be one of the base angles and the top angle (if the triangle is tipped over). Also, the base angle are equal in an equilateral triangle - although an equilateral triangle is a special kind of isosceles triangle.

49.5 units

If the base of an isosceles triangle is 11 and its perimeter is 39, then it has a height of 12.87.

In effect what you are asking is "does 5 + 5 + 5 = 6 + 6 + 3?" which of course it does. Is it the word perimeter that caused confusion?

It can be a pyramid shape with an equilateral triangle base

84.87

Area = 0.5*base*altitude

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