(1) A pool with an average water depth of 1 m does not mean that the water depth in all parts of the pool is 1 m, and some places may be much deeper than1.2m..

Therefore, it is dangerous for a student with a height of 1.2 meters to swim at the average water depth of 1 meter.

(2) Because the area formula of a circle is S=πr2, S: R2 = π (certain).

Therefore, the area of a circle is proportional to the square of the radius, not to the radius;

(3) Because the sum of the internal angles of the triangle is 180, there are at least two acute angles in the triangle;

(4) According to the characteristics of the magnifying glass, we know that only the side length of the triangle has been enlarged, but the shape has not changed.

Therefore, the acute angle of 10 in the triangle is still 10 after being magnified by a magnifying glass of10 times;

So the judgments are: ×, √, √, ×.