設(shè)菱形長(zhǎng)對(duì)角線：X
設(shè)菱形短對(duì)角線：Y
X - Y = 2 (1) Y = X - 2 (1')
(X/2)^2 + (Y/2)^2 = 5^2 (2) “菱形兩個(gè)對(duì)角線相互垂直、互相平分"
由(2)(1') -->
X^2 + Y^2 = 100 --> X^2 + (X - 2)^2 = 100 --> X^2 - 2X - 48 = 0
(X - 8)(X + 6)= 0
X = 8
Y = 6
菱形的面積 S = XY/2 = 48/2 = 24 m^2