An inscribed circle is "touching" all 3 sides of the triangle it is inscribed in.
What is incircle of a triangle?
The incircle or inscribed circle of a triangle is the largest circle contained in the triangle, it touches (is tangent to) the three sides.
Since, we know that " a circle which is inscribed in a triangle touches all the sides of a triangle and is called incircle".
Therefore, the suitable word for the given blank space will be "touching".
Hence, the correct statement will be
An inscribed circle is "touching" all 3 sides of the triangle it is inscribed in.
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