The term Sthalakosh refers to a geographical or regional encyclopedia that provides detailed information about various places — including their history, geography, culture, and society. It documents and preserves the identity of local regions.
Sthalakoshas are vital for studying local history and linking it to larger historical narratives. They help in cultural preservation, academic research, and planning based on historical insights.
\[ \text{Sthalakosh = Encyclopedia of Local Geography, Culture, and History.} \]
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.