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Add the lengths of the three individual sides.

Q: How do you get the perimeter of an isosceles triangle?

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The perimeter of any triangle is the sum of its 3 sides.

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

It is the sum of the lengths of its sides.

Perimeter of the isosceles triangle: 16.2+16.2+8.1 = 40.5 cm

The isosceles triangle has a perimeter of: 14+14+9 = 37 feet

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The perimeter of any triangle is the sum of its 3 sides.

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

If you mean "isosceles" triangle, the perimeter is the sum of twice the known side plus the base.

It is the sum of the lengths of its sides.

I don't see any isosceles triangle below.In general, the perimeter is the sum of the lengths of all sides. Note that in an isosceles triangle, two of the three sides have the same length.

Perimeter of the isosceles triangle: 16.2+16.2+8.1 = 40.5 cm

Lengths of: equal side+equal side+base = perimeter

The isosceles triangle has a perimeter of: 14+14+9 = 37 feet

Perimeter = 81+81+29 = 191 units of measurement

Perimeter = 45+58+58 = 161 units of measurement

24cm each

You cannot since there is insufficient information.