area of a rectangle is length x height, area of a triangle is 1/2 base x height, so it all depends on what the object is. What object did you have in mind? Doctor Chuck aka mathdoc
The equation for calculating the area of a circle is A r2, where A represents the area and r is the radius of the circle.
The base equation for calculating the area of a rectangle is length multiplied by width.
Area=Length x width or A= L x W
The area of a square (the word "rectangle" is redundant), with sides of length s units, is s^2 square units.
By calculating the discriminant of the equation and if it's negative the equation will have no solutions
The equation for calculating the normal force acting on an object is: Normal force mass x gravity.
calculating surface area
The base and height when calculating the area of a triangle are always perpendicular with each other.
The equation for calculating the polar moment of inertia of a cylinder is I ( r4) / 2, where I is the polar moment of inertia and r is the radius of the cylinder.
The equation for calculating the transverse velocity of a wave is v f, where v is the transverse velocity, is the wavelength of the wave, and f is the frequency of the wave.
There are a great many equations for calculating current; it depends on the context in which you need to calculate current.
V=distance divided by time