Ever Eaten A Square Pizza?

Geometry Level 2

Usually, pizzas are circular and they come in boxes with a square base. The circular pizza covers some percentage of area of the square base of the box. Let's say someone makes a square pizza and puts it in a box with a circular base. Will the square pizza cover more percentage of area in the box with circular base than the circular pizza in the box with square base?

Assume that both the pizzas fit perfectly inside their respective boxes.

Both occupy the same percentage of area No Depends on the size of pizzas and boxes Yes

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

5 solutions

Discussions for this problem are now closed

Vivek Sedani
Apr 21, 2014

fraction of area occupied by the square pizza under the circular base is 2/pi whereas fraction of area occupied by the circular pizza inside the square base is pi/4. Clearly first is less then second.

pls explain where do you got pi/4 and 2/pi?

Hafizh Ahsan Permana - 7 years, 1 month ago

put a square in a circle of radius r, draw both diagonals in the square and you will get 4 right triangles with both cathetus r. sum the area of the 4 triangles and you will get the area of the square (2 r²). the ratio of the square/circle is (2 r²)/(pi r²) = 2/pi put a circle in a square, you will get a circle with radius r and a square with side 2 r. the ratio of the circle/square is (pi r²)/(4 r²) = pi/4

Arthur Missao - 7 years, 1 month ago

Can we take a small example, consider a square base of area 4 units, and find the area not covered, and take the area of circular base to be 4, and find the uncovered area,

Prasanna Kulkarni - 7 years, 1 month ago

You are right but it depends on the 'size of pizza' in the box.What if circular pizza is small?

Kevin Patel - 7 years, 1 month ago

  1. It is said that the pizza fits perfectly inside the box. and
  2. we are talking about percentage of area.!!

vivek sedani - 7 years, 1 month ago

You may see that area o circle < of suare

Kevin Patel - 7 years, 1 month ago

it's good....

fatma ahsan - 7 years, 1 month ago
Daryl Ng
Apr 25, 2014

*I don't know how to type in subscript, can someone enlighten me?

You have 2 cases, let X X be symbols of what we are looking for.

A : A: Round pizza X r p X^{rp} in Square box X s b X^{sb}

B : B: Square pizza X s p X^{sp} in Round box X r b X^{rb}

A : A:

Let the Sides of the Square box be:

l s b = 2 m l^{sb}=2m

Then the Area of the Square box will be:

A s b = ( l s b ) 2 A^{sb}=(l^{sb})^2

A s b = 4 m 2 A^{sb}=4m^{2}

Then the Radius of the Round pizza will be:

r r p = ( l s b ) / 2 r^{rp}=(l^{sb})/2

r r p = 1 m r^{rp}=1m

Then the Area of the Round pizza will be:

A r p = π ( r r p ) 2 A^{rp}=\pi (r^{rp})^2

A r p = π m 2 A^{rp}=\pi m^2

Then the Percentage of Area in case A A will be:

P e r c e n t a g e O f A r e a c a s e A = [ ( A r p ) / ( A s b ) ] 100 % Percentage - Of - Area^{case A}=[(A^{rp})/(A^{sb})] *100\%

P e r c e n t a g e O f A r e a c a s e A = [ π / 4 ] 100 % Percentage - Of - Area^{case A}=[\pi /4] *100\%

P e r c e n t a g e O f A r e a c a s e A = 78.54 % Percentage - Of - Area^{case A}=78.54\%

B : B:

Let A s p = A r p A^{sp}=A^{rp}

Then:

A s p = π m 2 A^{sp}=\pi m^2

Then the Sides of the Square pizza will be:

l s p = π m l^{sp}=\sqrt\pi m

Then the Radius of the Round box will be:

r r b = ( π / 2 ) 2 + ( π / 2 ) 2 r^{rb}=\sqrt{({\sqrt\pi}/2)^2+({\sqrt\pi}/2)^2}

r r b = ( π / 4 ) + ( π / 4 ) r^{rb}=\sqrt{(\pi/4)+(\pi/4)}

r r b = π / 2 m r^{rb}=\sqrt{\pi/2} m

Then the Area of the Round box will be:

A r b = π ( r r b ) 2 A^{rb}=\pi(r^{rb})^2

A r b = π 2 / 2 m 2 A^{rb}=\pi^2 /2 m^2

Then the Percentage of Area in case B B will be:

P e r c e n t a g e O f A r e a c a s e B = [ ( A s p ) / ( A r b ) ] 100 % Percentage - Of - Area^{case B}=[(A^{sp})/(A^{rb})] *100\%

P e r c e n t a g e O f A r e a c a s e B = [ 2 π / π 2 ] 100 % Percentage - Of - Area^{case B}=[2\pi /\pi^2] *100\%

P e r c e n t a g e O f A r e a c a s e B = [ 2 / π ] 100 % Percentage - Of - Area^{case B}=[2 /\pi] *100\%

P e r c e n t a g e O f A r e a c a s e B = 63.66 % Percentage - Of - Area^{case B}=63.66\%

Thus, Percentage of Area of Round pizza in Square box is more than the Percentage of Area of a Square pizza in a Round box.

The Answer of this question would be: N o . No.

To do subscripts, you use . For example, x 1 produces x 1 x_1 .

Note that if you want to use text in Latex, it often looks better if you type \text{ }. For example,

\text{ Percentage Of Area} ^ { \text{case B} } = 63.66 \%

produces Percentage Of Area case B = 63.66 % \text{ Percentage Of Area} ^ { \text{case B} } = 63.66 \%

Calvin Lin Staff - 7 years ago

I'm sorry for the long answer, but I tried my best to clarify for those who do not understand from other solutions

Daryl Ng - 7 years, 1 month ago
Cesar Conterno
Apr 24, 2014

pi/4 > 2/pi, R.: "No"

2 + 3 = ? \sqrt { 2 } \quad +\quad \sqrt { -3 } \quad =\quad ?

Ahsan Ahmed - 7 years, 1 month ago

It's not a real value equation!

Kevin Patel - 7 years, 1 month ago
Sirisha Avvari
Apr 25, 2014

(square in circle)2/pi < (circle in square)pi/4

Fatma Ahsan
Apr 29, 2014

The square pizza will cover less area i compression with respective circular pizza . If 'a' be the diameter of the pizza the corresponding diameter side of the box should be 'a'.

0 pending reports

×

Problem Loading...

Note Loading...

Set Loading...