The Triangle is a plane closed figure composed by 3 straight lines that do not
intersect, but are joined at their extremities.
All the right triangle has one of the angles measuring 90 degrees or PI/2 radians. In a right triangle, taken as base, one of its sides, except for the side "c", known as the hypotenuse, the height is equal to another side, perpendicular to the base.
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Right Triangle Isosceles Triangle Equilateral Triangle Scalene Triangle Square Rectangle Trapezium Right-Angled Trapezoid Isosceles Trapezoid Rhombus Regular polygon Polygon names Circle Pyramid Triangle pyramid Square pyramid Rectangular pyramid Cube Prism Rectangle Prism Cone Cylinder Sphere Ellipse Parabola Hyperbola