how do u calculate the length of the diagonal line in a rectangle?

Answer 1

Plenty of correct answers above, but for the record, the means used is called the Pythagorean Theorem and the ancient Greek fellow who came up with it was named Pythagoras.

Answer 2

Pythagorean Theorem: a^2 +b^2 =c^2

otherwise, the square root of (a^2 +b^2) = c

where a and b are the lengths of the sides of the rectangle and c is the diagonal line of the rectangle.

Remeber, you can use Pythagorean Theorem because you can cut the rectangle into two triangles diagonally.

Answer 3

L^2+H^2=Diagonal^2

Answer 4

Pythagorus' Theorem; straight side^2 x other straight side^2 = diagonal^2. To get the diagonal side calculate the square root of the diagonal squared.

Answer 5

Use the Pythagorgous Theorem.

cut the rectangle into 2 triangles and use:
a squared = b squared + c squared
to find the missing side

Answer 6

If you mean a right-angled triangle, the square on the hypotenuse is equal to the sum of the squares on the two adjacent sides.

Answer 7

Good old Pythaguran Theorem.

A squared + B squared= C squared
so square two ajacent sides of the rectangle
add them together
and then find the square root of that sum.

Answer 8

By pythagorous theorem

Diagonal= Squre root of ( length^2 + breadth^2)

That is, you find square of length, square of breadth/with, add the two, and find the square root of the sum.

Answer 9

Oh dear, I've forgotten this completly after my exams, wiped it from my mind.

But now I have to do GCSE Math retake in sixth form, the horror!

Answer 10

by definition the two "halves" will be right angled triangles - now go do a web-search on pythagoras' theory.