STEP 1: find angle $ \alpha $

To find angle $ \alpha $ use formula:

$$ \sin \left( \alpha \right) = \dfrac{ h }{ a } $$

After substituting $h = 13.71\, \text{cm}$ and $a = 14.59\, \text{cm}$ we have:

$$ \sin \left( \alpha \right) = \dfrac{ 13.71\, \text{cm} }{ 14.59\, \text{cm} } $$ $$ \sin \left( \alpha \right) = 0.9397 $$ $$ \alpha = \arcsin\left( 0.9397 \right) $$ $$ \alpha = 69.9987^o $$

STEP 2: find angle $ \beta $

To find angle $ \beta $ use formula:

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

After substituting $ \alpha = 69.9987^o $ we have:

$$ 69.9987^o + \beta = 90^o $$ $$ \beta = 90^o - 69.9987^o $$ $$ \beta = 20.0013^o $$

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