Primary activities involve direct use of natural resources—agriculture, mining, forestry, and fishing. These activities form the foundation of Brazil’s economy and exports.
Brazil’s vast farmlands and mineral belts support large-scale farming and mining. Ports, railways, and rivers are optimized to transport these primary goods.
Although industries and services are growing, exports, employment, and regional livelihoods are still heavily tied to primary activities like soy, coffee, beef, and iron ore.
Primary activities form the backbone of Brazil’s economy despite ongoing diversification.
\[ \textbf{Primary activities remain Brazil’s core economic base.} \]

In the following figure \(\triangle\) ABC, B-D-C and BD = 7, BC = 20, then find \(\frac{A(\triangle ABD)}{A(\triangle ABC)}\). 
The radius of a circle with centre 'P' is 10 cm. If chord AB of the circle subtends a right angle at P, find area of minor sector by using the following activity. (\(\pi = 3.14\)) 
Activity :
r = 10 cm, \(\theta\) = 90\(^\circ\), \(\pi\) = 3.14.
A(P-AXB) = \(\frac{\theta}{360} \times \boxed{\phantom{\pi r^2}}\) = \(\frac{\boxed{\phantom{90}}}{360} \times 3.14 \times 10^2\) = \(\frac{1}{4} \times \boxed{\phantom{314}}\) <br>
A(P-AXB) = \(\boxed{\phantom{78.5}}\) sq. cm.