## What is the formula for finding the diagonal of a rectangle?

If the length and width of a rectangle are 15.1 by 13.0, then you can use the pythagorean theorem to calculate the length of the diagonal since it forms a right triangle.

The pythagorean formula is a^2 + b^2 = c^2.” Let a=15.1 and b=13.

15.1 squared equals 228.01; 13 squared equals 169; add them together for 397.01.

## How do you find the diagonal of a rectangle calculator?

Find the Diagonal of a Rectangle –

## How do you find diagonals?

The number of diagonals in a polygon that can be drawn from any vertex in a polygon is three less than the number of sides. To find the total number of diagonals in a polygon, multiply the number of diagonals per vertex (n – 3) by the number of vertices, n, and divide by 2 (otherwise each diagonal is counted twice).

## What is the diagonal of square?

Diagonals of a square. A square has two diagonals, which are line segments linking opposite vertices (corners) of the square. In other words, the point where the diagonals intersect (cross), divides each diagonal into two equal parts. Each diagonal divides the square into two congruent isosceles right triangles.

## What is the diagonal of a triangle?

A diagonal of a polygon is a line from a vertex to a non-adjacent vertex. So a triangle, the simplest polygon, has no diagonals. You cannot draw a line from one interior angle to any other interior angle that is not also a side of the triangle.

## What is the diagonal measurement?

equals the length of a right triangle’s hypotenuse. You use the Pythagorean Theorem because a diagonal of a rectangle cuts the rectangle into two congruent right triangles. The length and width of the rectangle are the side lengths of the triangle; the diagonal is the hypotenuse of the triangle.

## How do you find the diagonal of a quadrilateral?

The length of a diagonal of a square is times the length of a side; since the rhombus has perimeter 80, each side measures one fourth of this, or 20, and diagonal has length .

## Are diagonals of rectangle perpendicular?

As you can see from the pictures to the left, the diagonals of a rectangle do not intersect in a right angle (they are not perpendicular). (Unless the rectangle is a square.) And the angles formed by the intersection are not always the same measure (size). Opposite central angles are the same size (they are congruent.)