The perimeter of any triangle is the sum of its 3 sides.
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If the base of an isosceles triangle is 11 and its perimeter is 39, then it has a height of 12.87.
No. An isosceles right triangle is a special case. There are many right triangles which are not isosceles.
It is the sum of the lengths of its sides.
A right angled isosceles triangle!
Perimeter of the isosceles triangle: 16.2+16.2+8.1 = 40.5 cm