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Yes. What you should watch out for is that, to form a triangle, none of the segments should be longer (or as long as) the other two segments combined. Just check whether the longest segment is longer than the sum of the other two - if it is, then you can't form a triangle.
No, segments 1, 8, and 8 cannot form a triangle. In order for three segments to form a triangle, the sum of the lengths of any two sides must be greater than the length of the third side. In this case, 1 + 8 is equal to 9, which is not greater than 8. Therefore, a triangle cannot be formed.
A triangle can't have.
Letters that can form 1 or 2 polygons with an additional line segment typically include those with straight edges and closed shapes. For example, the letter "A" can be viewed as a triangle (polygon) with an extra line segment forming the crossbar. Similarly, the letter "H" can be seen as two rectangles (polygons) connected by a line segment. Other letters like "O" and "C" could also be adapted creatively to fit this criterion.
That would be the height when determing the area of the triangle. A= 1/2 base x height