Plane Figures  - Triangle
     
      Solving the right triangle
     Equilateral and Isosceles Triangle
      Equilateral triangle
      Isosceles triangle
     
Solving the right triangle
To solve a right triangle means to find all unknown sides and angles using its known parts.
While solving a right triangle we use Pythagorasí theorem and trigonometric functions of an acute angle depending which pair of its parts is given.
Note, right triangles are usually denoted as follows;  c stands for the hypotenuse,  a and b for the perpendicular sides called legs, and a and b for the angles opposite to a and b respectively. 
There are four basic cases that can occur, given
             a) hypotenuse and angle,            c) hypotenuse and leg,  
              b) leg and angle,                         d) two legs.
Equilateral and Isosceles Triangle
Equilateral triangle
                          perimeter  P = 3a
Isosceles triangle
 
perimeter  P = a + 2b
Beginning Algebra Contents D
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