How to change polar form to rectangular form by calculator?

First set casio fx115es to complex mode, which is done by clicking on mode then #2. 2nd, make sure you casio is set to Degree not Radian or anything else. Do this by clicking Shift then mode then click #3.

So, if you have a rectangular problem like this: 3.866+j1.013 --- and you want to turn that Rectangular to polar, you would hit Shift then + key (POL - for polar). Then type in 3.866 then hit shift comma, which is the closed paranthesis then type in 1.013 then close the paranthesis. So, on your Calc screen it would look like this

Pol ( 3.866, 1.013)

answer would look like this:
r = 3.99673
0 = 14.6952

The zero above represents Theta. Hope this helps. First set casio fx115es to complex mode, which is done by clicking on mode then #2. 2nd, make sure you casio is set to Degree not Radian or anything else. Do this by clicking Shift then mode then click #3. So, if you have a rectangular problem like this: 3.866+j1.013 --- and you want to turn that Rectangular to polar, you would hit Shift then + key (POL - for polar). Then type in 3.866 then hit shift comma, which is the closed paranthesis then type in 1.013 then close the paranthesis. So, on your Calc screen it would look like this Pol ( 3.866, 1.013) answer would look like this: r = 3.99673 0 = 14.6952 The zero above represents Theta. Hope this helps.