Area of a Sector Calculator
⬛ Area & perimeter (2D). Use the Area of a sector formula to find sector area, angle θ, radius: pick the value you want, type the others, and the answer updates as you go.
Sector area13.09 cm²
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Sector area | cm² |
| Angle θ | ° |
| Radius | cm |
Worked example
Find the sector area when Angle θ = 60 °, Radius = 5 cm.
Using A = θ/360 × π r²: Sector area = 13.09 cm².
Frequently asked questions
What is the formula for Area of a sector?
A = θ/360 × π r².
What do the letters stand for, and what units are used?
Sector area in cm², Angle θ in °, Radius in cm.
How do you calculate sector area?
Put the values into A = θ/360 × π r². For example, with Angle θ = 60 °, Radius = 5 cm, sector area = 13.09 cm².
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (sector area, angle θ, radius) and fill in the others: it rearranges the formula for you.
