Properties of Figures - JSS1 Mathematics Past Questions and Answers - page 2

In a rectangle, the diagonals are equal in length and bisect each other at right angles. 

To find the length of the diagonal 𝑑 of a rectangle with sides 𝑎 and 𝑏, you can use the Pythagorean theorem: 

𝑑=𝑎2+𝑏2. 

This formula derives from considering the rectangle as two right triangles with sides 𝑎, 𝑏, and diagonal 𝑑.