123Trig

Your Trigonometry Pal

Learn and calculate areas, volumes, and perimeters of geometric figures in seconds.
123Trig is a free, multilingual visual tool — ideal for middle and high school students.

Little Intro: Geometry isn’t just about shapes on paper — it’s the secret behind so many everyday things! From figuring out how many tiles fit in your bathroom, to how much paint fills your walls, or even picking the right air conditioner for your room — it’s all geometry. Once you see it, you can’t unsee it!

123Trig is a simple, multilingual calculator built for students. It helps you learn and compute geometric figures quickly, without distractions.

Select a shape, input dimensions, and get instant results for perimeter, area, or volume. All formulas are shown visually and translated to your language.

123Trig es una calculadora visual y multilingüe pensada para estudiantes. Ayuda a aprender y resolver figuras geométricas de forma rápida y sin distracciones.

Selecciona una figura, ingresa sus dimensiones, y obtén al instante el perímetro, área o volumen. Todas las fórmulas se muestran de forma visual y en tu idioma.

123Trig est une calculatrice simple et multilingue conçue pour les élèves. Elle permet de comprendre et résoudre des figures géométriques rapidement, sans distractions.

Choisissez une forme, entrez ses dimensions, et obtenez instantanément le périmètre, la surface ou le volume. Toutes les formules sont affichées visuellement et traduites dans votre langue.

123Trig é uma calculadora simples e multilíngue feita para estudantes. Ela ajuda a aprender e resolver figuras geométricas de forma rápida e sem distrações.

Selecione uma forma, insira as dimensões e veja instantaneamente o perímetro, área ou volume. Todas as fórmulas são mostradas visualmente no seu idioma.

123Trig ist ein einfaches, mehrsprachiges Tool für Schüler. Es hilft dir, geometrische Figuren schnell und ohne Ablenkung zu verstehen und zu berechnen.

Wähle eine Form, gib die Maße ein und erhalte sofort Umfang, Fläche oder Volumen. Alle Formeln werden visuell dargestellt und übersetzt.

123Trig è una calcolatrice semplice e multilingue pensata per gli studenti. Aiuta a comprendere e risolvere figure geometriche in modo rapido e senza distrazioni.

Seleziona una figura, inserisci le dimensioni e ottieni subito perimetro, area o volume. Tutte le formule sono mostrate visivamente e tradotte nella tua lingua.

🟪 The 2D Universe — or Flatland!

Welcome to Flatland — a world with only length and width, no depth allowed! It’s where geometry begins: the realm of drawings, tiles, and blueprints.

Square
a
Formulas
= 4a = a²
Results
Rhombus
d₁ d₂ a
Formulas
= 4 x a = b x h
Results
Rectangle
l w
Formulas
= 2(l + w) = l × w
Results
Parellelogram
b s h
Formulas
= 2 x (b + a) = b x h
Results
Triangle
b h
Formulas
not implemented = (b × h) / 2
Results
Right Triangle
b a=h c
=>
Formulas
= (b × h) / 2 = a + b + c Pythagoras: c² = a² + b² ->: c = √(a² + b²)
Results
Isosceles Triangle
b h a a
=>
Formulas
= b + 2(a) a = √((b/2)² + h²) (Pythagoras: h² + (b/2)²=a²) = (b × h) / 2
Results
Equilateral Triangle
a a a h
=>
Formulas
= 3a h = (√3 / 2) × a Pythagoras: h² + (a/2)²=a² = (√3 / 4) × a²
Results
Pentagon
a ap
Formulas
= 5a = (Perimeter × ap)/2
Results
Hexagon
a ap
Formulas
= 6a = ((3√3) / 2) × a² or = (Perimeter × ap)/2
Results
Regular n-gon
ap a r
Formulas
= n × a = n x ( a x ap ) /2 or = (Perimeter × ap)/2 Pythagoras: r² = (a/2)² + ap² -> ap² = r² - (a/2)²
Results
Circle
r
Formulas
= 2πr = πr²
Results
Ellipse
a b
Formulas
= π x a x b = approximation out of scope
Results

🌐 The 3D Universe — Space Awaits!

Step into the world of depth, height, and width — where geometry comes alive! Explore cubes, prisms, cylinders, cones, and spheres.

Cube
a a a
Formulas
= 6a² = a³
Results
Rectangular Prism
l H w
Formulas
= 2(l*w + l*H + w*H) = l × w × H
Results
Generic Straight Prism
A straigh prism with any polygonal base — straight means "super regular" here.
H
Formulas
V = A × H S = 2A + P × H
Results
Oblique Prism
A prism where the sides are tilted. The base is the same, but the height is measured vertically.
H
Formulas
S = 2A + Area of Sides V = A × H
Results
Triangular Pyramid
H h b
Formulas
= Not available = (((b x h)/2) x H)/3 = (b × h × H) / 6
Results
Generic Pyramid
A pyramid built from any polygonal base. Just enter the base area and the height.
H
Formulas
V = (A × H) / 3
Results
Generic Oblique Pyramid
A pyramid whose apex is offset from the base’s center — here with a flattened star base.
H
Formulas
S = A + Area of all sides V = (A × H) / 3
Results
Cylinder
r H
Formulas
= 2πr² + 2πrH = πr²H
Results
Cone
r h
Formulas
= πr² + πr√(r² + H²) = (1/3)πr²H
Results
Sphere
r
Formulas
= 4πr² = (4/3)πr³
Results