Question

the estimated percentage break-up of the cost of construction of a house (excluding cost of land) is as follows:

Labour	Bricks	Cement	Steel & Timber	Marble	Miscellaneous
20%	12%	25%	15%	13%	15%

Construct a pie diagram to represent the given data.

Answer 1

The percentage values are converted into degree values using the following formula.
$$\begin{gathered} \mathrm{Degree}\mathrm{share}=\frac{\mathrm{Percentage}\mathrm{share}}{100}\times 360 \\ =\mathrm{Percentage}\mathrm{share}\times 3.6 \end{gathered}$$

Items	Expenditure (in percent)	Degree Share
Labour Bricks Cement Steel and timber Marble Miscellaneous	20 12 25 15 13 15	20 × 3.6 = 72° 12 × 3.6 = 43.2° 25 × 3.6 = 90° 15 × 3.6 = 54° 13 × 3.6 = 46.8° 15 × 3.6 = 54°
		360°