The dimensions of a closed rectangular box are measured as 60 centimeters, 60 centimeters, and 90 centimeters, respectively, with the error in each measurement at most .2 centimeters. Use differentials to estimate the maximum error in calculating the surface area of the box.

The maximum error in calculating the surface area of the box is

Step-by-step explanation:

The differential df of a function is related to the differentials dx, dy, and dz by

We can use this relationship to approximate small changes in f that result from small changes in x, y and z.

Let the dimensions of the box be , , and for length, width, and height, respectively.

The surface area of a box is the total area of each side and is given by

The change in area can be written as:

From the information given the partial derivatives are evaluated at , , and , and .

The partial derivatives are

Substituting these in for ,

Thus, the maximum error in calculating the surface area of the box is

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.