Question

Calculate the perimeter of this rhombus

A. 12 cm
B. 36 cm
C. 42 cm
D. 16 cm

Answer 1

Hint: Make use of the definition of perimeter of a polygon and try to solve it.Perimeter is nothing but the sum of all the sides of a polygon
Formula used: Perimeter = sum of all sides

Complete step-by-step answer:
In a rhombus, all sides are equal therefore, perimeter becomes four times the side
Side of rhombus = 9cm
$ \Rightarrow $ perimeter of rhombus = 4 x length of each side
$ = 4 \times 9$
$ = 36cm$
So, from this we get
  Perimeter = 9 + 9 + 9 + 9= 36 cm
Therefore, the perimeter of a rhombus with side 9 cm is 36 cm.
Hence, the correct option is B.

Note:Remember that in a rhombus (i) all sides are equal (ii) diagonal bisect each other at right angles.
In plane Euclidean geometry, a rhombus (plural rhombi or rhombuses) is a quadrilateral whose four sides all have the same length.