Given the triangle ABC, the distance between a point P in the triangle and the three sides of the triangle is 3cm. Find the perimeter of the triangle ABC It must be answered in the way of sixth grade

The radius of the inscribed circle is 3cm. We can't determine the perimeter of the triangle. In the picture, the red perimeter is obviously larger than the blue perimeter
The topic is meaningless. (your child's teacher made a mistake in the topic. Don't worry, it's a common occurrence.)

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