You have a Hexagon, named EUNHA S . Also, you are given that:
If the value of ( m ( E A ) ) 2 can be express as a + b c where c is a prime, what is the value of ⌊ a + b + c ⌋ ?
Clarification:
m ( A X ) means the length or measurement of line segment A X for example, while m ( ∠ R E S ) means the measurement of angle R E S ⋅
For more problems like this, try answering this set .
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The problem came from this.
Consider an equilateral triangle E N A , with a point P located inside that triangle such that, E P = 1 9 , P N = 1 8 0 , P A = 1 8 1 ⋅
Now, reflect point P with respect to line segment E N . Let's name the point of reflection U ⋅
So, we can conclude that: E U = 1 9 , U N = 1 8 0 ⋅
Next, reflect point P again, this time respect to line segment E A . Let's name the point of reflection S ⋅
Again, we can conclude that: E S = 1 9 , S A = 1 8 1 ⋅
Lastly, reflect point P with respect to line segment A N . Let's name the point of reflection H ⋅
So, we can conclude that H N = 1 8 0 , H A = 1 8 1 ⋅
It is left to the readers how m ( ∠ U E S ) = m ( ∠ U N H ) = m ( ∠ H A S ) = 1 2 0 ∘ ⋅
Connecting the 6 points will give us the Hexagon, named EUNHA S .
As △ E U S is isosceles, ⟹ ∠ E U S = 3 0 ∘
As △ U N H is isosceles, ⟹ ∠ N U H = 3 0 ∘
As △ S U H is right (right-angled at U ), ⟹ ∠ E U N = 3 0 ∘ + 3 0 ∘ + 9 0 ∘ = 1 5 0 ∘ ⋅
As the quadrilateral E U N P is a kite, ⟹ ∠ E P N = 1 5 0 ∘ ⋅
and therefore,
( m ( E A ) ) 2 = ( m ( E N ) ) 2 = 1 9 2 + 1 8 0 2 − 2 ( 1 9 ) ( 1 8 0 ) ( cos ( 1 5 0 ∘ ) ) = 3 2 7 6 1 + 3 4 2 0 3 = a + b c ⟹ a = 3 2 7 6 1 , b = 3 4 2 0 , c = 3 ⟹ ⌊ a + b + c ⌋ = ⌊ 3 2 7 6 1 + 3 4 2 0 + 3 ⌋ = 1 9 0
This is what is it look like. :)
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