Triangle Formulas

This page focuses on formulas related to triangles, including general triangles and right triangles specifically.

For general triangles, the key formulas are:

Perimeter: sum of all three sides $a + b + c$

Area: (base × height) / 2

Highlight: The area formula for a triangle is always half the area of a rectangle with the same base and height.

Inverse formulas are provided to find individual side lengths from the perimeter or to calculate base or height from the area.

For right triangles, additional formulas are given:

Perimeter: sum of two catheti and hypotenuse

Area: (cathetus₁ × cathetus₂) / 2 or (hypotenuse × height) / 2

Vocabulary: Catheti are the two shorter sides of a right triangle that form the right angle.

Definition: The hypotenuse is the longest side of a right triangle, opposite the right angle.

These formulas allow for solving various problems involving triangles when given different sets of information about their dimensions.

Rhombus and Trapezoid Formulas

This page covers formulas for two more quadrilateral shapes: the rhombus and trapezoid.

For rhombuses, the key formulas are:

Perimeter: 4 × side length

Area: (diagonal₁ × diagonal₂) / 2 or side length × height

Highlight: A rhombus has four equal sides, simplifying its perimeter calculation.

For trapezoids, the formulas provided include:

Perimeter: sum of all four sides $B + b + a + c$

Area: ($B + b$ × height) / 2

Definition: In a trapezoid, B and b represent the parallel sides (bases), while a and c are the non-parallel sides.

The page also includes a formula for finding the distance between the parallel sides at their midpoint: $B - b$ / 2

Example: For a trapezoid with bases 8 cm and 6 cm, and a height of 4 cm, the area would be $(8 + 6) × 4$ / 2 = 28 cm².

Diagrams are included to illustrate the relevant dimensions for both shapes, aiding in understanding and application of the formulas.

Pythagorean Theorem

This page is dedicated to the Teorema di Pitagora, a fundamental principle in geometry relating the sides of a right triangle.

The main formula presented is:

i² = C₁² + C₂²

Where: i = hypotenuse C₁ and C₂ = catheti (the two shorter sides forming the right angle)

Highlight: This theorem states that in a right triangle, the square of the hypotenuse is equal to the sum of squares of the other two sides.

The page also provides inverse formulas to find each cathetus:

C₁ = √$i² - C₂²$ C₂ = √$i² - C₁²$

Example: In a right triangle with catheti of 3 and 4 units, the hypotenuse would be √$3² + 4²$ = √$9 + 16$ = √25 = 5 units.

A clear diagram of a right triangle is included, labeling the hypotenuse and catheti for easy reference.

Vocabulary: The hypotenuse $i$ is always the longest side of a right triangle and is opposite the right angle.

This theorem is crucial for solving many geometric problems and has applications in various fields beyond mathematics.

Circle Formulas

This page focuses on formulas related to circles, a fundamental shape in geometry.

Key formulas presented include:

Circumference: diameter × π (pi) or 2 × radius × π

Area: radius² × π

Definition: π (pi) is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.

The page also provides formulas for calculating arc length (L) given the central angle $a$ in degrees:

L = (a × C) / 360°

Where C is the circumference.

Inverse formulas are also given to find the angle or circumference when other values are known.

Example: For a circle with radius 5 cm, the area would be 5² × π ≈ 78.54 cm².

A diagram of a circle is included, clearly labeling the radius for reference.

Highlight: The area of a circle is always π times the square of its radius, a fundamental relationship in geometry.

These formulas are essential for solving various problems involving circles, from basic geometry to more advanced applications in physics and engineering.

Prisma

L'ultima pagina del formulario si concentra sul prisma, una figura geometrica tridimensionale fondamentale nello studio della geometria 2 pdf. Vengono presentate le formule per il calcolo dell'area totale, dell'area laterale e del volume di un prisma generico e di un parallelepipedo rettangolo.

Definizione: Un prisma è un solido geometrico con due basi poligonali congruenti e parallele, unite da facce laterali rettangolari.

Formula: Volume del prisma = Area di base × altezza

Highlight: Per il parallelepipedo rettangolo, il volume si calcola semplicemente moltiplicando le tre dimensioni: V = a × b × c.

Esempio: Un prisma retto con area di base 12 cm² e altezza 5 cm avrà un volume di 60 cm³.

Queste formule sono essenziali per lo studio della geometria solida e sono spesso incluse in geometria Zanichelli pdf e altri testi avanzati di geometria.

Rectangle and Parallelogram Formulas

This page covers the fundamental formulas for rectangles and parallelograms, two important quadrilateral shapes in geometry.

For rectangles, the key formulas provided are:

Perimetro rettangolo: 2 × (base + height)

Definition: The perimeter is the distance around the outside of the shape.

Formule rettangolo area: base × height

Highlight: The area formula for a rectangle is one of the simplest and most commonly used in geometry.

Inverse formulas are also given to find the base or height when given the perimeter and one side, or to find base or height from the area.

For parallelograms, similar formulas are provided for perimeter and area. The perimeter formula is the same as for rectangles, while the area is calculated as base × height.

Example: For a rectangle with base 5 cm and height 3 cm, the area would be 5 × 3 = 15 cm².

The page includes helpful diagrams labeling the relevant dimensions for both shapes.