Areas and perimeters

AREAS

· Square:

· Rectangle:

   A = b·h = w·l

· Triangle:

· Parallelogram:

   A = b·h

· Rhombus:

· Trapezium:

· Other polygons:

  

· Circle: A = π·r²

· Circumference: L = 2·π·r 

 

PERIMETERS

The perimeter of a polygon is the distance around the outside of a shape.

For example:

- Square: P = 4 · s

- Rectangle: P = 2b + 2h

- Triangle: P = a + b + c

 

 

Exercise: calculate the area and perimeter of these figures:

1.

  

2.

 

 

 

 

Solutions: 1) A = 64.57 m²; P = 33.69 m; 2) A = 2.36 m²; P = 9.42 m