Advertisements
Advertisements
प्रश्न
Pizza factory has come out with two kinds of pizzas. A square pizza of side 45 cm costs ₹ 150 and a circular pizza of diameter 50 cm costs ₹ 160 (Figure). Which pizza is a better deal?
उत्तर
Given, side of square pizza = 45 cm
∴ Area of a square pizza = (Side)2 = (45)2 = 2025 cm2
Diameter of circular pizza = 50 cm
∴ Radius = `50/2` = 25 cm ......`[∵ "Radius" = "Diameter"/2]`
Now, area of the circular pizza = `22/1 xx 25 xx 25`
= `22/7 xx 625`
= `13750/7`
= 1964.28 cm2 ......[∵ Area of circle = πr2]
∴ Price of 1 cm square pizza = `2025/150` = ₹ 13.5
and price of 1 cm circular pizza = `1964.28/160` = ₹ 12.27
Hence, the circular pizza is a better deal.
APPEARS IN
संबंधित प्रश्न
A circular flower bed is surrounded by a path 4 m wide. The diameter of the flower bed is 66 m. What is the area of this path? (π = 3.14)
In the following figure, shows the cross-section of railway tunnel. The radius OA of the circular part is 2 m. If ∠AOB = 90°, calculate:
the height of the tunnel
If diameter of a circle is increased by 40%, then its area increase by
ABCD is a square of side 4 cm. If E is a point in the interior of the square such that ΔCEDis equilateral, then area of Δ ACE is
The radius of a wheel is 0.25 m. How many revolutions will it make in covering 11 km?
If a square in inscribed in a circle, find the ratio of the areas of the circle and the square.
The radius of a circular wheel is 42 cm. Find the distance travelled by it in :
(i) 1 revolution ;
(ii) 50 revolutions ;
(iii) 200 revolutions ;
The radii of the two circles are 4 cm and 3 cm respectively. The diameter of the circle having an area equal to the sum of the areas of the two circles (in cm) is ____________.
If the radii of two circles are in the ratio of 4 : 3, then their areas are in the ratio of ______.
What is the diameter of a circle whose area is equal to the sum of the areas of two circles of radii 40cm and 9cm?
