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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.
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