Louis Koo
Ah Fai
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A triangle is a polygon with three corners and three sides, one of the basic shapes in geometry. The corners, also called vertices, are zero-dimensional points while the sides connecting them, also called edges, are one-dimensional line segments. The triangle's interior is a two-dimensional region.
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Learn the names, properties and formulas of different types of triangles, such as equilateral, isosceles and scalene. Find out how to calculate the perimeter, area and angles of a triangle using Heron's formula or Pythagoras' theorem. Play with interactive triangles and try to guess the equal angles.
Learn about the properties, types, and angles of triangles in geometry. Explore theorems, formulas, and examples of triangles with interactive exercises and videos.
Learn what triangles are, how to classify them based on angles and sides, and how to find their area and perimeter. Explore real-life examples, non-examples, and practice problems with interactive games and worksheets.
Learn about the triangle shape, its parts, properties, formulas, and classification. Find examples, worksheets, and FAQs on triangles.
Learn about the basic concepts of triangles, such as angles, sides, perimeter, area and types of triangles based on their angles and sides. Find out how to calculate the sum of the angles, the exterior angles, the lengths of the sides and the area of a triangle using formulas and examples.
A triangle is a 3-sided polygon with 3 sides, 3 angles, and 3 vertices. Learn how to name, label, and classify triangles using sides, angles, and congruence. Explore the special types of triangles such as right, acute, obtuse, equilateral, isosceles, and scalene. See how to use arcs and tally marks to indicate the measure of angles and sides.
