Case Study - 1

In an annual day function of a school, the organizers wanted to give a cash prize along with a memento to their best students. Each memento is made as shown in the figure and its base

Question

Case Study - 1

In an annual day function of a school, the organizers wanted to give a cash prize along with a memento to their best students. Each memento is made as shown in the figure and its base ABCD is shown from the front side. The rate of silver plating is Rs. 20 per cm$^2$.

The memento consists of a quadrant ODCO of radius 7 cm at the top and a triangle AOB with base and height of 10 cm each at the bottom.

(i) What is the area of the quadrant ODCO?

Accepted Answer

Step 1: Area of sector ODCO $= \frac{90}{360} 	imes \frac{22}{7} 	imes 7 	imes 7 = \frac{77}{2}$ or $38.5$ cm$^2$

Question

Solution