Son of Daguerre said:
Rocky said:
My calculation come up slightly different than yours.
3:2 ratio is approx. 4.13 in²
4:3 ratio is approx. 4.32 in²
9÷5=1.8
9÷7=1.2857142857142857142857142857143
Both your starting line does not make sense.
Geometry rule : For right angle triangle, The sum of the square of 2 sides of the right angle equals the square of the side opposite of the triangle.
The LCD screen is a rectangle. The diagonal is 3"
For 3:2 ratio: (3X)^2+(2X)^2= 3X3 solve for X. X= 0.8321
(X is a "unit length", 3X is the width of the screen, 2x is the height of the screen)
screen area= (3*0.83)*(2*0.83)= 4.15 in 2
(my previous calculation rounded 0.83XXXX to 0.83)
For 4:3 ratio: (4Y)^2+(3Y)^2= 3X3 solve for Y. Y=0.6000
(Y is a "unit length", 4Y is the width of the screen, 3Y is the height of the screen)
screen area= (4*0.6000)*(3*0.6000)= 4.32 in 2
So my calculation is right and you are off.