Question

in the figure if angle bc =45degree,ab=6cm find bc

Answer 1

Answer:

From right angled △ABC,

(i)

AC

BC

=sin45

∘

3

2

BC

=

2

1

Or BC=3

(ii) By Pythagoras theorem

(AB)

2

=(AC)

2

−(BC)

2

=(3

2

)

2

−(3)

2

=18−9

=9

AB=3 cm.