### Теория:

Area of a triangle: To obtain the area of a triangle multiply the base by the height and then divide by \(2\).

\(Area (A) = 1/2(b × h)\) or \(b × h / 2\)

Thus, the height of triangle \(h = Area × 2 / b\)

And, the base of triangle \(b = Area × 2 / h\)

Where \(h\) is denoted as height.

Where \(b\) is denoted as base.

**To obtain the perimeter of a triangle, add the lengths of each of its \(3\) sides.**

**The perimeter of a triangle:**\(Perimeter (P) = AB + BC + CA\).

\(Perimeter (P) = a + b + c\).

Where \(a, b, c\) is denoted as the length of three sides.