You can read posting Sarin learns Perimeter, Area and Volume in school(Math Concept) to learn the concept of perimeter, area and volume.
Lower primary school mathematics question LPQ33
Find the perimeter of the figure below.
Length a = 16 – 6 = 10cm
Perimeter of the figure = 10 + 6 + 5 + 10 + 5 + 16 = 52cm