+0  
 
+1
36
4
avatar+623 

http://prntscr.com/l8qhmm

critical  Oct 21, 2018
 #1
avatar+103 
+1

the answer is 2c because the base is 4c and half the base is where the vaiable a is.

MATHEXPERTISE  Oct 21, 2018
 #2
avatar+13612 
+1

Drop a plumb bob from A to show   a = 2c      or    c= a/2

ElectricPavlov  Oct 21, 2018
edited by ElectricPavlov  Oct 21, 2018
edited by ElectricPavlov  Oct 21, 2018
 #3
avatar+103 
+1

there's really no need for Pythagorean Theorem because its a equilateral triangle, so it's just 4c/2 == 2c

MATHEXPERTISE  Oct 21, 2018
 #4
avatar+13612 
+1

Thanx....I had already edited out my error....cheeky

ElectricPavlov  Oct 21, 2018

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