The formulas in GRE geometry for triangles include the area of the triangle and the Pythagorean Theorem as follows: Right angle triangle: one of the angles of the triangle is 90° and the longest side is called hypotenuse.Scalene: all sides are different in length and all angles are different in measure.Isosceles triangle: two sides are equal in length and two opposite angles are equal in measure.Equilateral triangle: all sides of the triangle are equal and each angle is of 60 degrees each.The concepts of GRE special triangles can be explained as follows: GRE Geometry problems need to be solved based on a set of concepts and formulas. GRE triangle questions are based on different types of triangles including isosceles, equilateral, right, obtuse, acute and scalene. GRE Geometry includes concepts of triangles. Consecutive interior angles add up to 180 degrees.When two parallel lines intersect eight angles are created.Opposite angles are equal in measure (∠A=∠B, ∠C=∠D).When two lines intersect, four angles are created:.Two lines that intersect at 90-degree angles are perpendicular to each other:.The symbol ∠ is often used to denote an angle.A right angle implies 90 degrees and is usually signified by a small square:.An obtuse angle refers to an angle between 90 and 180 degrees.An acute angle is an angle less than 90 degrees.Alternate exterior angles are equal in measure.Alternate interior angles are equal in measure.Corresponding angles are equal in measure.Two lines that never intersect but has the same slope are parallel lines.A straight line is equal to 180 degrees.There are certain concepts in lines and angles which need to be considered as follows: There are certain concepts that need to be considered in GRE Geometry problems for lines and angles. A line segment can be defined as two points having definite end points.A curve line can seem to extend from one point to another changing direction constantly.A straight line that has no end point and extends in both directions.There are different types of lines which are as follows: A line can be defined as a set of infinite points.
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