Answers:
scalene (column 1)
right triangle (column 2)
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Explanation:
The lack of tickmarks tells us indirectly that none of the sides are equal to one another. So all three sides are different lengths. Therefore, the triangle is scalene. This rules out "equilateral" and "isosceles".
The small square marker indicates we have right angle, aka 90 degree angle. In turn, it leads to the fact we have a right triangle. This rules out "acute" because acute triangles have all three angles smaller than 90. We can also rule out "obtuse" because obtuse triangles have one angle larger than 90.
In short, this triangle is both scalene and a right triangle. We can call it a right scalene triangle, or a right triangle that is scalene.
