[Tex/LaTex] Draw some circles and arrows

Question

I work with the latex class beamer (\usetheme{Warsaw}). In order to say the area C of mathematics was born from the area A and the area B, I need to draw two circles (area A and area B) in right and left with two arrows comes from them into the third one (area C) that is under and between them. Is there any idea how to draw it?

Answer 1

Inspired by https://tex.stackexchange.com/a/283917/36296

\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{arrows,positioning,trees} 

\tikzset{
    >=stealth',
    punkt/.style={
        circle,
        draw, 
        fill=blue!30,
        text centered},
    level 1/.style={sibling angle=120, level distance=1cm},
    edge from parent/.style= {draw=none},
}

\begin{document}
\begin{frame}
\begin{tikzpicture}

\coordinate (main) at (0,0) [clockwise from=270]
    child { node[punkt] (1) {A}}
    child { node[punkt] (2) {B}}
    child { node[punkt] (3) {C}}
;

\draw[->] (2) -- (1);
\draw[->] (3) -- (1);

\end{tikzpicture}
\end{frame}
\end{document}