Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Ideal Euclidean geometry. Use one consistent length unit. Measurements and derived quantities use floating-point arithmetic.
Example Calculation
- Side: 5 units
- Interior angle: 60 °
Side 5 and angle 60° give area 25√3/2, perimeter 20 and diagonals 5√3 and 5.
Frequently asked questions
How do I use this calculator?
Enter side, interior angle. The result updates automatically. Use Reset to restore the example values.
What method does it use?
area=a²sin θ; diagonals=2a cos(θ/2), 2a sin(θ/2); height=a sin θ.. Ideal Euclidean geometry. Use one consistent length unit. Measurements and derived quantities use floating-point arithmetic.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.