Types of parallelograms

Perimeter of a square

What do we need to know about the square? A square has four equal sides!
Formula: P = a + a + a + a
or
P = 4.a
The task from the example:
P = 4.2
P = 16 sm
Perimeter of a rectangle

What do we need to know about the rectangle? A rectangle consists of two opposite equal sides!
Formula: P = a + a + b + b
or
P = 2.a + 2.b
The task from the example:
P = 2.4 + 2.2
P = 12 sm
Types of triangles

Perimeter of an equilateral triangle

What should we know about this kind of triangle triangle? An equilateral triangle has three equal sides!
Formula: P = a + a + a
or
P = 3.a
The task from the example:
P = 3.2
P = 6 sm
Perimeter of an isosceles triangle

What should we know about this kind of triangle triangle? An isosceles triangle has two equal sides!
Formula: P = a + b + b
or
P = a + 2.b
The task from the example:
P = 2 + 2.3
P = 8 sm
Perimeter of a scalene triangle

What should we know about this kind of triangle triangle? Scalene triangle has no equal sides!
Formula:
P = a + b + c
The task from the example:
P = 2 + 3 + 4
P = 9 sm