Jawaban:

length ( l ) = 15 inches

width ( w ) = 7,5 inches

diagonal length ( d ) = 17 inches

question : if the table perfectly rectangular?

Penjelasan dengan langkah-langkah:

since we have diagonal length and know each diagonal divides the rectangle into two congruent right triangles, we can use Pythagoras theorem that is the sum of the squares on the legs of a right triangle is equal to the square on the hypotenuse (the side opposite the right angle). if we use algebraic notation it become:

l² + w² = d²

15² + 7,5² = 17²

225 + 56,25 = 289

281,25 = 289 => not same

since it's not same so it's not a right triangle and of course it's prove that the table is not perfectly rectangular

hope that will help you, sorry for my bad english ^_^")