x+y = 12
x^2+y^2 = 74
(x+y)^2 = x^2+y^2 + 2xy = 144
74+2xy=144
2xy=70
xy=35
35 = 7*5
So, the rectangle is 7x5
The perimeter of a rectangle is 24, and its diagonal is √74. Find its dimensions and area.
1 answer
1 answer