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Here we will learn about using the formula \pi r^2 (pi r squared) to calculate the area of a circle given the radius, diameter or the circumference. There are also worksheets based on Edexcel, AQA and OCR exam questions, along with further guidance on where to go next if you’re still stuck.
- Area of a Sector
Area of a sector formula: Area of a sector =...
- Parts of a Circle
What are the parts of a circle? The parts of a circle are...
- Equation of a Circle
Equation Of A Circle. Here we will learn about the equation...
- Arc Length
Arc Length. Here we will learn about calculating arc length...
- Circumference of a Circle
Therefore the below formula is for the circumference of any...
- Perimeter of a Sector
Perimeter Of A Sector. Here we will learn about calculating...
- Surface Area of a Sphere
As the surface area of a sphere is equal to 4\pi{r}^{2} ,...
- Circle Theorems
Circle theorems examples. Example 1: the alternate segment...
- Area of a Sector
25 wrz 2024 · R-squared in regression is a statistical measure that quantifies the proportion of the variance in the dependent variable that is predictable from the independent variable (s). In the context of a regression model, it provides a numerical indicator of how well the model fits the observed data.
22 kwi 2022 · The coefficient of determination (R²) is a number between 0 and 1 that measures how well a statistical model predicts an outcome. You can interpret the R² as the proportion of variation in the dependent variable that is predicted by the statistical model.
In geometry, the area enclosed by a circle of radius r is πr2. Here the Greek letter π represents the constant ratio of the circumference of any circle to its diameter, approximately equal to 3.14159.
How to Calculate the Area. The area of a circle is: π(Pi) times the Radius squared:A = πr2. or, when you know the Diameter:A = (π/4) × D2. or, when you know the Circumference:A = C2/ 4π. Example: What is the area of a circle with radius of 3 m ? Radius = r = 3. Area= πr2. = π× 32. = 3.14159... × (3 × 3) = 28.27 m2(to 2 decimal places)
The area of circle can be calculated by using the formulas: Area = π x r 2, in terms of radius ‘r’. Area = (π/4) x d 2 , in terms of diameter, ‘d’. Area = C 2 /4π, in terms of circumference, ‘C’.
The formula for the area of a circle is A = πr 2, where r is the radius of the circle. The unit of area is the square unit, for example, m 2, cm 2, in 2, etc. The area of a circle formula is useful for measuring the region occupied by a circular field or a plot.
