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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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