In ΔABC, right angled at B, AB = 3 cm, AC = 6 cm. Find BC without pythagoras.
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Answer:
Draw a right angled △ABC using given instructions:
Here sin30=
AC
BC
2
1
=
AC
6
Or AC=12 cm
By Pythagoras theorem:
(AB)
2
=(AC)
2
−(BC)
2
=(12)
2
−(6)
2
=108
AB=6
3
cm.
Step-by-step explanation:
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