Perimeter Formulas for Geometric Figures
Perimeter of a triangle
The perimeter of the triangle ∆ABC is the sum of the lengths of its sides
Perimeter of a square
The perimeter of a square is the product of the length of a square side by 4.
The perimeter of a square is the product of the length of a square diagonal by 2√2.
a - the lenth of a square side,
d - the length of a square diagonal.
Perimeter of a rectangle
The perimeter of the rectangle ABCD is equal to twice the sum of the sides adjacent to one corner.
a, b - the length of rectangle sides,i.e., the height and width accordingly.
Perimeter of a parallelogram
Perimeter of the parallelogram ABCD is equal to twice the sum of the sides adjacent to one corner.
a, b - lengths of parallelogram sides.
Perimeter of a rhombus
The perimeter of a rhombus is equal to the product of the length of its side into four.
a - the length of a rhombus side.
Perimeter of a trapezoid
The perimeter of a trapezoid is equal to the sum of the lengths of its sides.
a, b - the length of 2 trapezoid bases,i.e., the parallel sides,
c, d - length of the legs (the lateral sides).
Perimeter of a circle (Circumference)
r - the length of the circle radius,
d - the length of the circle diameter,
π = 3.141592.
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