Real depth Dr= Apparent depth/ refractive index of water
Dr= Da / n water
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usage of herons formula in real life
Real GDP/Capita
When we study the motion of body then its displacement is described on cartesian plane or in 3d geometry and not in real physical conditions,in this way to calculate the distance travelled by the body is a major aspect in calculating its speed and other things,and here distance formula help us to do so.There are many other importance of distance formula...
real life using of gradient
If the discriminant of b2-4ac in the quadratic equation formula is less than zero then the equation will have no real roots.