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www.mathsisfun.com/triangle

Imagine you "doubled" the triangle (flip it around one of the upper edges) to make a square-like shape (a parallelogram) which can be changed to a simple rectangle: THEN the whole area is bh, which is for both triangles, so just one is ½ × bh.

en.wikipedia.org/wiki/Triangle

Triangles that do not have an angle measuring 90° are called oblique triangles. A triangle with all interior angles measuring less than 90° is an acute triangle or acute-angled triangle. If c is the length of the longest side, then a 2 + b 2 > c 2, where a and b are the lengths of the other sides.

www.mathwarehouse.com/geometry/triangles/triangle-types.php

Triangles can be classified by various properties relating to their angles and sides. The most common classifications are described on this page.

www.coolmath.com/reference/triangles-types

Types of Triangles. Definitions and formulas for triangles including right triangles, equilateral triangles, isosceles triangles, scalene triangles, obtuse triangles and acute triangles Just scroll down or click on what you want and I'll scroll down for you! ...

www.basic-mathematics.com/types-of-triangles.html

Types of triangles may be classified by their sides, by their angles or by a combination of both sides and angles. Triangles classified by their sides: Scalene triangle: A scalene triangle is a triangle that has no equal sides.

www.onlinemathlearning.com/types-of-triangles.html

Types of Triangles - right triangles, acute triangles, obtuse triangles, oblique triangles, equilateral triangles, equiangular triangles, isosceles triangles and scalene triangles, examples and step by step solutions, how to solve problems involving angles and sides of triangles, examples with step by step solutions

www.mathgames.com/skill/5.3-types-of-triangles

Earn up to 5 stars for each level The more questions you answer correctly, the more stars you'll unlock!

betterlesson.com/lesson/resource/2983501/triangle-types-pdf

I'd like for you and your partners to use your tools to make observations about each type of triangle. Your goal is to come up with a definition for each triangle type! I wonder who is going to figure out what makes each of these triangles so special! Conferencing . Just as before, I tried to conference with each group of students during this time.

www.brainpop.com/math/geometryandmeasurement/typesoftriangles

Hypotenuse, acute, or obtuse, Tim and Moby introduce you to some of the sharpest three-sided shapes around.