In the trigonal shape ️ABC <ABC=60°, BC=200 Cm, then AB=? & AC=?
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Answer:
Consider △ ABC and △ BAH
cos(∠ABC)=
BC
AB
(∵△ABC is a right angled triangle and from definition of cos)
cos(∠ABH)=
AB
BH
(∵△ABH is a right angled triangle and from definition of cos)
∠ABC=∠ABH
⇒
BC
AB
=
AB
BH
⇒BH=
BC
AB×AB
=
100
60×60
=36 cm
Step-by-step explanation:
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