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ABC is an equilateral triangle with point D on line BC such that AD =

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ABC is an equilateral triangle with point D on line BC such that AD =  [#permalink]

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New post 17 Jul 2018, 23:22
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ABC is an equilateral triangle with point D on line BC such that AD = 4 units. What is the area of triangle ABC in square units?

(1) AD is perpendicular to BC.

(2) D is mid point of BC.
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Re: ABC is an equilateral triangle with point D on line BC such that AD =  [#permalink]

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New post 18 Jul 2018, 00:09
ABC is an equilateral triangle with point D on line BC such that AD = 4 units. What is the area of triangle ABC in square units?

Look at the attached figure. In \(\triangle{ADB}\), we know one side and one angle thus the triangle can be of any size. so if we know ANY angle or ANY side, we can find all the sides as the triangle will be unique

(1) AD is perpendicular to BC.
If AD is perpendicular, AD is altitude and we can find sides and thus area of triangle
AD=4=\(side*\sqrt{3}/2\)
you can find side and thus area..
suff

(2) D is mid point of BC.
D is a midpoint means it is also perpendicular bisector
same as above
suff

D
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Re: ABC is an equilateral triangle with point D on line BC such that AD = &nbs [#permalink] 18 Jul 2018, 00:09
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