Brazil has a vast coastline of approximately 7,400 km along the Atlantic Ocean. The coastal region is characterized by:
Major cities like Rio de Janeiro, São Paulo, and Salvador.
A warm and humid climate with tropical rainforests.
High population density due to better economic opportunities.
Important ports facilitating international trade.
A tourism industry driven by beaches and natural beauty.
Economic activities such as fishing, shipping, and oil exploration.
\[ {\text{The coastal region plays a crucial role in Brazil's economy and culture.}} \]
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.