lungimea b
latimea a
a / 5 = b /12 = ( a + b) / ( 5 + 12 ) = 272 / 17 = 16
perim = 2a + 2b = 544
a + b = 544 :2
a + b = 272
atunci a / 5 =16 a = 5 · 16 = 80 cm
b / 12 = 16 b = 12 · 16 = 192 cm
diagonala d² =a² + b² = 80² + 192² = 6400 + 36864 = 43264
d = √43264 = 208 cm
