Question

The diagonals of a rhombus measure 10cm and 24cm. Find its perimeter.
Reiny
Since they right-bisect each other, you will have 4 congruent right-angled triangles, with legs of 5 and 12. Perhaps you recognize the 5-12-13 right-angled triangle, if not use Pythagoras to find the hypotenuse to be 13
So the perimeter is ......