Q82 of 131 Page 226

Pizza factory has come out with two kinds of pizzas. A square pizza of side 45 cm costs Rs. 150 and a circular pizza of diameter 50 cm costs Rs.160 (Fig. 9.36). Which pizza is a better deal?

Given, side of square pizza = 45 cm


∴ Area of square pizza = (45)2 = 2025 cm2


Price of 2025 cm2 of square pizza = Rs. 150


Price of 1 cm2 of square pizza = = Rs. 13.5


Diameter of circular pizza = 50 cm


i.e. Radius = =25 cm


∴ Area of circular pizza = πr2 = × (25)2 =1964.28 cm2


Price of 1964.28 cm2 of square pizza = Rs. 160


Price of 1 cm2 of circular pizza = = Rs. 12.27


Since price of 1 cm2 of circular pizza is lesser, hence circular pizza is a better deal.


More from this chapter

All 131 →
80

Rani bought a new field that is next to one she already owns (Fig. 9.34). This field is in the shape of a square of side 70 m. She makes a semi circular lawn of maximum area in this field.

(i) Find the perimeter of the lawn.


(ii) Find the area of the square field excluding the lawn.


 81

In Fig. 9.35, find the area of parallelogram ABCD if the area of shaded triangle is 9 cm2.

 83

Three squares are attached to each other as shown in Fig. 9.37. Each square is attached at the mid point of the side of the square to its right. Find the perimeter of the complete figure.

 84

In Fig. 9.38, ABCD is a square with AB = 15 cm. Find the area of the square BDFE.