Question

What is the perimeter of a triangle, who has a circle inscribed in it with a radius of 4.2?

Answer 1

See explanation.

Explanation:

If you want a numeric answer , I'm sorry you can't have one. There could be simply so many triangles with radius of incircle as `4.2 cm`.

However we have a relation.
`r*p/2=triangle` (where r is radius and p is perimeter and `triangle` is area of triangle)