QUADRILATERAL
The perimeter of a quadrilateral is the total length of its boundary. For example, the perimeter of a quadrilateral ABCD can be
expressed as, Perimeter = AB + BC + CD
+ DA. This means if all the sides of a quadrilateral are known, we can get its perimeter by adding all its sides.
TRIANGLE
The area of a triangle is defined as the total region that is enclosed by the three sides of any particular triangle. Basically, it is equal to half of the base times height, i.e. A = 1/2 × b × h.