met de rekenmachine

$
\eqalign{
& \tan \angle C = \frac{{AB}}
{{BC}} \cr
& \tan \angle C = \frac{4}
{3} \cr
& \angle C \approx 53^\circ \cr}
$

q6725img1.gif

$
\eqalign{
& \tan \angle C = \frac{{AB}}
{{BC}} \cr
& \tan 53^\circ = \frac{4}
{x} \cr
& x = \frac{4}
{{\tan 53^\circ }} \approx 3 \cr}
$

q6725img2.gif

$
\eqalign{
& \tan \angle C = \frac{{AB}}
{{BC}} \cr
& \tan 53^\circ = \frac{x}
{3} \cr
& x = 3 \cdot \tan 53^\circ \approx 4 \cr}
$

q6725img3.gif

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