Geometry Calculator - Adlam Numerals
Calculate area, volume, perimeter, and surface area for circles, triangles, rectangles, spheres, and more geometric shapes with Adlam numeral system support.
About This Numeral System
Adlam numerals (U0001e950 through U0001e959) are the digits of the Adlam script, created in 1989 by two Guinean brothers, Ibrahima and Abdoulaye Barry, as a writing system for Fulani (Fula) — a Niger-Congo language spoken by roughly 25 million people across West Africa, including Guinea, Nigeria, Senegal, Mali, and Cameroon. The name “Adlam” is an acronym from the first four letters of the script, standing for “Alkule Dandayɗe Leñol Mulugol” — “the alphabet that prevents peoples from vanishing.” Adlam is written right-to-left and was added to Unicode in 2016. This calculator displays results in Adlam numerals for users who read and write in Fulani using the Adlam script.
A free online geometry calculator for 2D and 3D shapes. Calculate area and perimeter for circles, triangles, rectangles, squares, parallelograms, trapezoids, pentagons, hexagons, and ellipses. Calculate volume and surface area for spheres, cubes, rectangular prisms, cylinders, cones, and pyramids. The calculator can also solve for a missing dimension when you know the area or volume — for example, find the radius of a circle given its area. Each result includes the formula used, the substitution of values, and step-by-step intermediate calculations, making it a learning tool as well as a calculator.
How This Calculator Works
Geometry Formulas: Circle: A = πr², P = 2πr | Triangle: A = ½ × b × h | Sphere: V = 4/3 πr³
Each shape uses its standard formula. The calculator substitutes the input values into the formula and shows each intermediate step. For solving unknown dimensions, the formula is rearranged algebraically — for example, given the area of a circle, the radius is computed as r = √(A / π).
Frequently Asked Questions
How do I find the area of an irregular shape?
For irregular shapes, break them into regular shapes you can calculate. For an L-shaped room, split it into two rectangles, calculate each area, and add them. For a circular segment combined with a rectangle, calculate each part separately. The calculator supports all the common shapes you need for this decomposition approach.
What is the difference between surface area and lateral area?
Lateral area is the area of only the sides of a 3D shape — not including the base or top. Surface area includes all faces: the sides plus the base and top. For a cylinder, lateral area is 2πrh (the curved side only), while total surface area is 2πrh + 2πr² (the side plus both circular ends). The calculator shows both values where applicable.
How does the calculator handle the volume of a truncated cone?
Select the 3D category and choose "Cone" or the frustum option if available. Enter the top radius, bottom radius, and height. The calculator uses the formula V = (1/3)πh(R² + Rr + r²), where R and r are the two radii. This is useful for calculating the volume of buckets, planters, and architectural elements.
What can the geometry calculator do?
The geometry calculator supports 2D shapes (circle, triangle, rectangle, square, parallelogram, trapezoid, pentagon, hexagon, ellipse) and 3D shapes (sphere, cube, rectangular prism, cylinder, cone, pyramid). For 2D shapes it calculates area and perimeter. For 3D shapes it calculates volume and surface area. It can also solve for a missing dimension when given the area or volume.
How do I use the pyramid geometry calculator?
Select the 3D category and choose "Pyramid". Enter the base dimensions and height (or slant height, depending on what you know). The calculator computes the volume using V = (1/3) × base_area × height and the surface area including all triangular faces. For a square pyramid with base side 4 and height 6, the volume is (1/3) × 16 × 6 = 32 cubic units.
How does the solution steps feature work?
Click the "Show Solution" button after calculating to see step-by-step work. This includes the formula used, substitution of values, intermediate calculations, and the final answer. This is perfect for learning how geometry formulas work and verifying calculations.
Is this an online geometry calculator?
Yes. This is a free online geometry calculator that runs entirely in your browser with no download or sign-up. It supports both 2D and 3D shapes, shows step-by-step solutions, and can solve for missing dimensions. All calculations happen locally on your device.
How is Adlam different from other scripts created in modern times?
Adlam is one of the few scripts intentionally created in the 20th century that has gained real adoption. Unlike Ol Chiki (created 1925 for Santali in India), Adlam was created in 1989 for Fulani in West Africa. Both scripts were designed to serve languages that lacked a dedicated writing system, but Adlam is written right-to-left (like Arabic) while Ol Chiki is written left-to-right. Adlam was added to Unicode in 2016, making it one of the newest scripts in the Unicode standard.
Worked Examples
Input: Circle with radius 5 cm
Result: Area = π × 5² = 78.54 cm². Perimeter = 2π × 5 = 31.42 cm.
Input: Rectangle 6 m × 4 m
Result: Area = 6 × 4 = 24 m². Perimeter = 2(6 + 4) = 20 m.
Key Features
- 10 two-dimensional shapes
- 6 three-dimensional shapes
- Solve for unknown dimensions
- Detailed step-by-step working
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