Mahabir Singh Solutions for Chapter: Heron's Formula, Exercise 2: EVERYDAY MATHEMATICS

An umbrella is made by stitching $12$ triangular pieces of cloth of two different colours as shown in given figure. Each piece measuring $40 \mathrm{cm}$, $40 \mathrm{cm}$and $18 \mathrm{cm}$. How much cloth of each colour is required for the umbrella?

The perimeter of a field in the form of an equilateral triangle is $36 \mathrm{cm}$,
then its area is given by

Tanya joined four triangles of cardboard to create a mask of Joker as shown in the given figure. Find the total area of the mask. [ given $\sqrt{2}=1.41,\sqrt{3}=1.73]$

Suman made a picture with some white paper and a single coloured paper as shown in figure. White paper is available at her home and free of cost. The cost of coloured paper used is at the rate of $10p \mathrm{per} {\mathrm{cm}}^2$.Find the total cost of the coloured paper used.(take $\sqrt{3}=1.732 \mathrm{and} \sqrt{11}=3.32$)