Additional Geometric Shapes and Formulas

This page continues with formulas for more geometric shapes, expanding on the formulario geometria piana (plane geometry formula sheet).

1. Triangolo (Triangle): The area of a triangle is given by A = (b x h) : 2, where b is the base and h is the height (perpendicular to the base).

Example: For a triangle with base 6 cm and height 4 cm, the area would be A = (6 x 4) : 2 = 12 cm².

2. Trapezio (Trapezoid): The area formula for a trapezoid is A = $B + b$ x h : 2, where B is the length of the longer parallel side, b is the length of the shorter parallel side, and h is the height (perpendicular distance between the parallel sides).

Definition: A trapezoid is a quadrilateral with at least one pair of parallel sides.

3. Cerchio (Circle): For circles, two important formulas are provided:
   • Area: A = π r², where r is the radius
   • Circumference: C = 2π r

Highlight: The formulas for circles involve π (pi), an irrational number approximately equal to 3.14159.

This comprehensive formulario di geometria piana da stampare (printable plane geometry formula sheet) is an invaluable resource for students learning about aree figure piane (areas of plane figures) and solving problemi di geometria (geometry problems).

Formulario di Geometria Piana (Plane Geometry Formula Sheet)

This page presents formulas for calculating areas and other dimensions of common geometric shapes. The formulas are essential for solving problems related to area dei poligoni (polygon areas) and other geometric calculations.

Vocabulary: Geometria piana - plane geometry, the study of two-dimensional shapes and their properties.

The page covers the following shapes:

1. Quadrato (Square): The area formula for a square is A = l x l or A = d x d, where l is the side length and d is the diagonal. The diagonal can be calculated as d = l x √2 (approximately 1.414 times the side length).

Example: For a square with side length 5 cm, the area would be A = 5 x 5 = 25 cm².

2. Rettangolo (Rectangle): The area of a rectangle is given by A = b x h, where b is the base (width) and h is the height (length).

3. Parallelogramma (Parallelogram): The area formula for a parallelogram is A = b x h, where b is the base and h is the height (perpendicular distance between parallel sides).

Definition: A parallelogram is a quadrilateral with opposite sides parallel.

4. Rombo (Rhombus): The area of a rhombus can be calculated using the formula A = (D x d) : 2, where D is the length of the longer diagonal and d is the length of the shorter diagonal.

Highlight: For all shapes, inverse formulas are provided to find dimensions like base or height when the area is known.