The length of a diagonal of a square is 2.6 inches. Find the perimeter of the square.

8.45 inches
2.68 inches
7.36 inches
6.82 inches

Question

The length of a diagonal of a square is 2.6 inches. Find the perimeter of the square.

8.45 inches 
   2.68 inches 
   7.36 inches 
   6.82 inches

campbell_st · Answer

ok... so draw a diagram 

|dw:1381730916599:dw|

find the value of x using pythagoras's theorem. 

then multiply the answer by 4 to get the perimeter

anonymous · Answer

how am I supposed to use Pythagoras theorem without knowing a or b ? ):

anonymous · Answer

Because you know c!

campbell_st · Answer

well its a square, they both have the same value... 

so looking at the diagram you can say

$$x^2 + x^2 = 2.6^2$$

campbell_st · Answer

all you need to do is 

1. solve for x

then multiply the answer by 4

campbell_st · Answer

umm when I did it I found 

$$2x^2 = 6.76$$

which means 

$$x = \sqrt{3.38}$$

then multiply that by 4

anonymous · Answer

7.36 (:

campbell_st · Answer

yep, thats it