Soh Cah Toa

Geometry Level 3

Find the length of the vertical dotted line x x .

4 3 + 3 10 \frac {4 \sqrt {3} + 3}{10} 4 2 + 3 5 \frac{4 \sqrt {2} + 3}{5} 6 3 + 3 10 \frac{6 \sqrt {3} + 3}{10} 4 2 + 1 10 \frac{4 \sqrt {2} + 1}{10} 4 3 + 3 9 \frac{4 \sqrt {3} + 3}{9}

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2 solutions

Aiden Lu
Sep 23, 2015

i did 4 3 + 3 9 \frac{4 \sqrt3 + 3}{9} so saddd

Yellow Tomato - 5 years, 7 months ago

We have sin ( arcsin 0.8 1 + arcsin 0.5 3 2 ) \sin { (\arcsin { \frac { 0.8 }{ 1 } } +\arcsin { \frac { 0.5 }{ \frac { \sqrt { 3 } }{ 2 } } } ) } So, sin ( arcsin 4 5 + arcsin 3 3 ) b u t sin ( α + β ) = sin α cos β + cos α sin β \sin { \left( \arcsin { \frac { 4 }{ 5 } } +\arcsin { \frac { \sqrt { 3 } }{ 3 } } \right) } \\ but\quad \sin { \left( \alpha +\beta \right) } =\quad \sin { \alpha } \cos { \beta } +\cos { \alpha } \sin { \beta } sin ( arcsin 4 5 + arcsin 3 3 ) = 4 5 ( 6 3 ) + 3 5 ( 3 3 ) sin ( arcsin 4 5 + arcsin 3 3 ) = 4 6 + 3 3 15 \sin { \left( \arcsin { \frac { 4 }{ 5 } } +\arcsin { \frac { \sqrt { 3 } }{ 3 } } \right) } \quad =\quad \frac { 4 }{ 5 } (\frac { \sqrt { 6 } }{ 3 } )\quad +\quad \frac { 3 }{ 5 } (\frac { \sqrt { 3 } }{ 3 } )\\ \sin { \left( \arcsin { \frac { 4 }{ 5 } } +\arcsin { \frac { \sqrt { 3 } }{ 3 } } \right) } \quad =\quad \boxed { \frac { 4\sqrt {6} +3\sqrt {3} }{ 15 } }

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