Explanation:
A triangle is one of the basic shapes of geometry: a polygon with three corners or vertices and three sides or edges which are line segments. A triangle with
vertices A, B, and C is denoted ABC.
In an isosceles triangle, two sides are equal in
length. An isosceles triangle also
has two angles of the same measure (Our solved
example in mathguru.com uses this concept);
namely, the angles opposite to the two sides of the same length; this fact is
the content of the Isosceles triangle theorem. Some mathematicians define
an isosceles triangle to have exactly two equal sides, whereas others define an
isosceles triangle as one with at least two equal sides. The latter definition would make all
equilateral triangles isosceles triangles.
http://en.wikipedia.org/wiki/Triangle
Right triangle
Right triangle
A right triangle (American English) or right-angled triangle (British English) is a triangle in which one angle is a right angle (that is, a 90degree angle). (Our solved example in mathguru.com uses this concept)
http://en.wikipedia.org/wiki/Right_triangle
The above explanation is copied from
Wikipedia, the free encyclopedia and is remixed as allowed under the Creative
Commons Attribution- ShareAlike 3.0 Unported License.
(Our solved example in mathguru.com also uses the below concept.
This is our own explanation, it is not taken from Wikipedia.)
To construct an isosceles right angled
triangle (if the measure of 1 side is given)
Steps of Constructions:
1. Draw a rough sketch with given measures.
2. Draw a line segment CB of length x units.
3. With C as centre, draw an arc of radius x units.
4. Join AB.
Hence, ABC is the
required triangle.