\documentclass[10pt]{article}
\usepackage{pgf,tikz,pgfplots}
\pgfplotsset{compat=newest}
\usepackage{mathrsfs}
\usetikzlibrary{arrows}
\pagestyle{empty}
\begin{document}
\definecolor{ududff}{rgb}{0.30196078431372547,0.30196078431372547,1.} %%%定义颜色
\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm]
\begin{axis}[
x=1.0cm,y=1.0cm,
axis lines=middle,
ymajorgrids=true,
xmajorgrids=true,
xmin=-4.3, %%%%% x的最小值
xmax=9.78, %%%%% x的最大值
ymin=-2.4199999999999986, %%%% y的最小值
ymax=6.3,
xtick={-4.0,-3.0,...,9.0}, %% x轴刻度
ytick={-2.0,-1.0,...,6.0},] %% y轴刻度
\clip(-4.3,-2.42) rectangle (9.78,6.3); %%%%坐标格,单位长度是1
\draw [line width=2.pt] (1.76,1.24) circle (3.cm); %%%圆周
\begin{scriptsize}
\draw [fill=ududff] (1.76,1.24) circle (2.5pt); %%% 画的蓝点
\draw[color=ududff] (1.9,1.61) node {$A$}; %%%% 点A
\draw[color=black] (0.32,3.57) node {$c$}; %%%% 点c
\end{scriptsize}
\end{axis}
\end{tikzpicture}
\end{document}

\usepackage{pgf,tikz,pgfplots}
\pgfplotsset{compat=newest}
\usepackage{mathrsfs}
\usetikzlibrary{arrows}
\pagestyle{empty}
\begin{document}
\definecolor{ududff}{rgb}{0.30196078431372547,0.30196078431372547,1.} %%%定义颜色
\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm]
\begin{axis}[
x=1.0cm,y=1.0cm,
axis lines=middle,
ymajorgrids=true,
xmajorgrids=true,
xmin=-4.3, %%%%% x的最小值
xmax=9.78, %%%%% x的最大值
ymin=-2.4199999999999986, %%%% y的最小值
ymax=6.3,
xtick={-4.0,-3.0,...,9.0}, %% x轴刻度
ytick={-2.0,-1.0,...,6.0},] %% y轴刻度
\clip(-4.3,-2.42) rectangle (9.78,6.3); %%%%坐标格,单位长度是1
\draw [line width=2.pt] (1.76,1.24) circle (3.cm); %%%圆周
\begin{scriptsize}
\draw [fill=ududff] (1.76,1.24) circle (2.5pt); %%% 画的蓝点
\draw[color=ududff] (1.9,1.61) node {$A$}; %%%% 点A
\draw[color=black] (0.32,3.57) node {$c$}; %%%% 点c
\end{scriptsize}
\end{axis}
\end{tikzpicture}
\end{document}

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