The only difference between どう and いかが is that いかが is more polite than どう.

Usages of dou

 は どう でした か。gogo wa dou deshita ka.
How was (your) afternoon?
どう しました か。dou shimashita ka.
What happened?; What's wrong?
ニュース に つい て どう おもう か。nyuusu ni tsui te dou omou ka.
What do you think about the news?
どう した んです か。dou shita ndesu ka.
What's wrong?; What's happened?
てん は どう です か。tenki wa dou desu ka.
How's the weather?
どう します か。dou shimasu ka.
What will you do?
かれ と の デート は どう でした か。kare to no deeto wa dou deshita ka.
How was the date with him?
らいしゅう は どう です か。raishuu wa dou desu ka.
How about next week?
えい を るの は どう です か。eiga o miruno wa dou desu ka.
How about seeing a movie?
そっち の てん は どう?sotchi no tenki wa dou?
How's the weather there (near you)?
how; by what means/method
きょ の ふく は どう おもいます か。kyou no fuku wa dou omoimasu ka.
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