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sneha sunil raikar Grade: 12
        

ABCDEF is a regular hexagon, prove that AB+AC+AD+AE+AF=3AD

7 years ago

Answers : (3)

AskiitianExpert Shine
10 Points
										Hi
Divide the hexagon into 4 triangles by joining AC, AD, AE .
Considering triangle ACD, v get AD= AC + CD
for Tri ADE , AD= AE + ED
Add the two eq=>
2AD= AC + CD + AE + ED

Now, AF = CD, because its a regular hexagon, therefore it has equal and parallel opposide sides.
Similarly , ED= AB
Substitute in the eq :
2AD= AB+ AC + AE + AF
Add one more AD both the sides and v get the desired result.
7 years ago
Krishna Deepakrao Kulkarni
33 Points
										From vector properties,
AB=ED,
AE+AB=AD,        ...(1)

Similarly,
AF=CD,
AC+AF=AD       ...(2)

From (1), (2)
AF+AC+AD+AE+AB=AD+AD+AD=3AD
7 years ago
Surendra Pandey
13 Points
										Here,To prove: AB+AC+AD+AE+AF=3ADNow,,  LHS= AB+AC+AD+AE+AF       = AB+AE+AC+AF+AD       = AE+ED+AC+CD+AD ( opposite sides of regular hexagon are equal So AB=ED & AF=CD )       = AD+AD+AD       =3AD #proved              =
										
2 months ago
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