# Thread: What is the perimeter of this rhombus

1. ## What is the perimeter of this rhombus

"In rhombus RHOM, the length of diagonal MH is 18 cm, and the measure of angle RHO = 60 degrees."
thank you in advance.

2. Originally Posted by ronmascara
"In rhombus RHOM, the length of diagonal MH is 18 cm, and the measure of angle RHO = 60 degrees."
thank you in advance.
first, make a sketch.

you need to use the following facts ...

1. all sides of a rhombus are equal in length.

2. the diagonals of a rhombus form four congruent right triangles within the rhombus.

3. the ratio of the sides of a 30-60-90 triangle is
$1 : 2 : \sqrt{3}$