Answer:
Hope's it helps
1. For TRIANGLE
We know perimeter of a triangle is the total length (distance) of the boundary of a triangle. Perimeter of a triangle is the sum of lengths of its three sides. = 2 cm + 4 cm + 3 cm, (add the length of each side of the triangle).
2. For SQUARE
Perimeter of a square is 4 times of s side. Perimeter of a square = 4 × length of a side. 1. Each side of a square is 2.5 cm
3 For RECTANGLE
a rectangle we know that two opposite sides are equal. So, PQ = SR and PS = QR
If PS = l and PQ = b
Perimeter of a Rectangle
2Save
Perimeter of the rectangle = PQ + QR + RS + SP
= b +l + b + l
= 2b +2l
Again,
ABCD is a rectangle. We know that the opposite sides of a rectangle are equal.
Perimeter of a Rectangle
AB = CD = 5 cm and BC = AD = 3 cm
So, the perimeter of the rectangle ABCD = AB + BC + CD + AD = 5 cm + 3 cm + 5 cm + 3 cm = 16 cm
It can be written as 5 cm + 5 cm + 3 cm + 3 cm
= (2 × 5) cm + (2 × 3) cm
= 2 (5 + 3) cm
= 2 × 8 cm
= 16 cm
4. For Octagon
Perimeter of Regular Octagon is equal to eight times the length its side.
In other words, the sides of a regular octagon are congruent. Each of the interior angle and the exterior angle measure 135° and 45° respectively, in a regular octagon.
...
Octagon Formulas.
Formulas for Octagon
Area of an Octagon 2a2(1+√2)
Perimeter of an Octagon 8a
Hope it helps
