triangle
Three wires of length , la, lb and lc form triangle
surmounted by
by another circular
wire If lc is
diameter lc = 21 then
then the
angle between la and lb , will be
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Answer:
Here, AB=l 1 ,BC=l 3 and AC=l 2
l 3=2 l 1 [ Given ]
If l3 is the diameter of a circle then the △ABC is right-angled triangle.
As angle form in semicircle is right angled.
⇒ cosB= l 1 /l 3= l 1 /2l 1 = 1 /2
⇒ cosB= 1 /2
⇒ B=cos^−1 1/2=60°
∴ The angle between l1 and l 3 will be 60 °
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