Geometry Test: Find the Perimeter of ABCDE

Bhavini

18 Aug 2016

How good were you in Geometry? Remember words like area and perimeter?

Test your knowledge in geometry with this picture riddle.

Find the perimeter of ABCDE in the picture below;

If you get the correct perimeter, leave your answers in the comment section and then share it with your friends on WhatsApp, Facebook and other social networking sites.

Show Answer

WE can see that 3 sides of ABCD are equal to 10 which means if we complete the quadrilateral ABCD by adding the line AD it would be a square.

So AD will also be equal to 10.

If you now consider the triangle AED you can find out from the given information that angles EAD & EDA are equal to 60 degrees.

So we can conclude that AED is an equilateral triangle.

So all sides will be equal;

AE = ED = AD = 10

So to find the perimeter of ABCDE we have to add all the sides of it;

AB + BC + CD + DE + EA = 10 + 10 + 10 + 10 + 10 = 50

Therefore;

Perimeter of ABCDE = 50