Hi@akhtar,
A pie chart with 3 dimensions can be drawn using additional packages. The package plotrix has a function called pie3D() that is used for this. You can use the below script.
library(plotrix)
x <- c(21, 62, 10,53)
lbl <- c("London","New York","Singapore","Mumbai")
png(file = "3d_pie_chart.jpg")
pie3D(x,labels = lbl,explode = 0.1, main = "Pie Chart of Countries ")