from this figure find length of AC
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The length of AC is 90°
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In △ABC
tan45=
BC
AB
AB=BC=x
In △ABD,
tan30=
BD
AB
BD=AB
3
BC+CD=AB
3
x+20=x
3
x=
3
−1
20
x=
3
−1
20
×
3
+1
3
+1
x=10(
3
+1)=27.32
Thus, AB=BC=27.32 cm
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