using TyPlot
# 圆的半径
radius = 2;    
# 创建角度向量
theta = range(0, stop=2*pi, length=100)
# 圆的x y轴坐标
x = radius * cos.(theta);
y = radius * sin.(theta);

# 绘制圆
figure();          
plot(x, y);       # 绘制圆
title("圆");

axis("equal") # 设置坐标轴刻度相等，确保圆不被拉伸