Definition: In geometry, a triangle is a 2-dimensional figure with three sides.
Definition: A right-triangle is a triangle with a right angle (90° angle)
Interactivity 1: Right triangle Directions for interactivity
Click and drag blue points in construction to move and rotate.Click and drag blue endpoints of base and height line to resize triangle.
|Basic formulas for triangles.
Examples with perimeter and area of right-triangles
| Interactivity 2: Construct a right-triangle with the given base and height.
This is a compass and straightedge (compass and ruler) construction. First, you will need to construct 2 perpendicular lines - Mathcast Then, using your compass tool, mark out the radius of the base on one perpendicular and the radius of the height on the other.
- Triangle, Similar, Congruent
- Medians of Triangles,
- Paralelogram, Rectangle
- Rhombus, Trapezoid, Quadrilateral
- Polygons, Triangles, Kite (Deltoid)
|Up one level|