Summer Clouds moderators
24/11/2017 at 13:54-
Let r be the radius of the pizza, then the length of the edge of the square is \(\sqrt{2}r\)
The area of the square is : \(\left(\sqrt{2}r\right)^2=2r^2\)
The area of the pizza is : \(r^2\pi\)
The area of the remaining pizza is : \(r^2\pi-2r^2=r^2\left(\pi-2\right)\)
The answer is : \(\dfrac{r^2\left(\pi-2\right).100}{r^2\pi}\%=100\left(1-\dfrac{2}{\pi}\right)\%\approx36\%\)
Selected by MathYouLike -
Nguyễn Hiền 29/11/2017 at 08:47
Please rendering a pizza of the pizza, then the length of the right of wide's square is √ 2 r2r
Dừng của hình vuông là: ( √ 2 r ) 2 = 2 r 2(2r)2=2r2
Khu vực pizza là: r 2 πr2π
Khu vực của bánh pizza còn lại là: r 2 π - 2 r 2 = r 2 ( π - 2 )r2π-2r2=r2(π-2)
Câu trả lời là: r 2 ( π - 2 ) .100 r 2 π% = 100 ( 1 - 2 π) % ≈ 36 %