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Mathematics
Mathematics
Problem
In an equilateral triangle ABC, if AD is an altitude then
4
A
D
2
4AD^2
4
A
D
2
is equal to (a)
2
B
D
2
2BD^2
2
B
D
2
(b)
B
C
2
BC^2
B
C
2
(c)
3
A
B
2
3AB^2
3
A
B
2
(d)
2
D
C
2
2DC^2
2
D
C
2
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