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Area of the triangle


                /|
              /  |
            /    |  h
          /      |
        /        |
      /__________|

           b

Consider a triangle with base length b and height h. 

The area of the triangle is 1/2 ?b ?h. 

Example: 

What is the area of the triangle below having a base of 
length 5.2 and a height of 4.2?


                /|\
              /  |  \
            /    |    \
          /  4.2 |      \
        /        |        \
      /__________|__________\ 
      |<------------------->|
	        5.2


The area of a triangle is half the product of its base 
and height, which is 1/2 ?.2 ?4.2 = 2.6 ?4.2 = 10.92.


Perimeter of the triangle


The perimeter is the distance around a closed plane figure.
 
The perimeter, P, of a triangle is given by the formula 
P = a + b + c

where a, b and c are the side lengths of the triangle.