Find the angle $ \beta $ of a rhombus if diagonal $d_1 = \frac{ 373 }{ 500 }$ and diagonal $d_2 = \frac{ 121 }{ 250 }$.

$\beta = 9.0986^o$

STEP 1: find angle $ \alpha $

To find angle $ \alpha $ use formula:

$$ \sin \left( \frac{ \alpha }{ 2 } \right) = \dfrac{ d_2 }{ d_1 } $$

After substituting $ d_2 = \frac{ 121 }{ 250 } $ and $ d_1 = \frac{ 373 }{ 500 } $ we have:

$$ \sin \left( \frac{ \alpha }{ 2 } \right) = \dfrac{ \frac{ 121 }{ 250 } }{ \frac{ 373 }{ 500 } } $$ $$ \sin \left( \frac{ \alpha }{ 2 } \right) = \frac{ 242 }{ 373 } $$ $$ \frac{ \alpha }{ 2 } = \arcsin\left( \frac{ 242 }{ 373 } \right) $$ $$ \frac{ \alpha }{ 2 } = 40.4507^o $$$$ \alpha = 40.4507^o \cdot 2 $$$$ \alpha = 80.9014^o $$

STEP 2: find angle $ \beta $

To find angle $ \beta $ use formula:

$$ \alpha + \beta = 90^o $$

After substituting $ \alpha = 80.9014^o $ we have:

$$ 80.9014^o + \beta = 90^o $$ $$ \beta = 90^o - 80.9014^o $$ $$ \beta = 9.0986^o $$

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