There are different formulas for different figures.
Some of the most common are:
triangle = half base times height, or 1/2*b*h
square = length times width, or l*w
rectangle = length times width, or l*w
circle = pi times radius squared, or pi*r^2
trapezoid =half the height times the sum of the bases, or h/2 (b1 + b2)
ellipse = pi times the product of radius one and radius two, or pi*(r1*r2)
parallelogram = base times height, or b*h
To find the area, first divide the shape into regular, simple shapes. Then use formulas to find the area of the smaller, regular shapes. Lastly, add up all the smaller areas to find the area of the original shape.
Use Heron's Formula
leanth times width
If the figure is irregular, you can't calculate its area (for example) with some simple formula. You need to use integration - which basically means to divide the figure into many narrow strips, which you assume to be rectangles.
To find the area, first divide the shape into regular, simple shapes. Then use formulas to find the area of the smaller, regular shapes. Then add up all the areas to find the area of the original shape.
Use the formula for the particular figure
To find the area, first divide the shape into regular, simple shapes. Then use formulas to find the area of the smaller, regular shapes. Lastly, add up all the smaller areas to find the area of the original shape.
To find the area, first divide the shape into regular, simple shapes. Then use formulas to find the area of the smaller, regular shapes. Lastly, add up all the smaller areas to find the area of the original shape.
Depends on what figure you are working on, each figure has its own formula for the area. So you need to do a sketch and label the relevant quantities which are needed to find the area. By using the perimeter value, find a formula for one quantity in terms of the other(s). Write the area as a function of just one variable. Find the domain of that variable. After that, use the derivative to find the desired global maximum or minimum (the highest or lowest points on the curve), which will give you the maximum or the minimum area of the figure you are interested in. If you have a specific problem, I can help more.
The formulae will contain variables representing measure of the figure: the lengths of sides, vertical distance between sides or a point and a side, angles and so on. Find their values for the figure - by measurement, if necessary - and substitute ino the formula. Evaluate [work out the value of] the formula.
If the base is a rectangle, use the formula for the area of a rectangle.
Use the formula 1/2 the base * the height
You didn't specify what figure you are talking about. Assuming a circle: divide the diameter by 2 to get the radius. Then use the well-known formula area = pi x radius2.You didn't specify what figure you are talking about. Assuming a circle: divide the diameter by 2 to get the radius. Then use the well-known formula area = pi x radius2.You didn't specify what figure you are talking about. Assuming a circle: divide the diameter by 2 to get the radius. Then use the well-known formula area = pi x radius2.You didn't specify what figure you are talking about. Assuming a circle: divide the diameter by 2 to get the radius. Then use the well-known formula area = pi x radius2.
Use Heron's Formula
Use YouTube or your bwain
To do this question, we have to ask ourself, what formula do you use to find the surface area of a sphere. The answer should be known to you, but it is 4πr2. Since we know how to find the surface area for a full sphere, then finding the surface for a half sphere is just half the job. You use the formula for the full sphere 4πr2, and divide it by 2... so (4πr2) / 2 . Voila!
It is a circle, so use the formula "pie r squared" to figure it out