7. In triangle ABC if angle a=x,angle b=y,angle c=z and x=4y/3 and y=3z/8 then find angle b

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I n Δ A B C, i f ∠ A = x, ∠ B = y a n d ∠ C = z

s u c h t h a t x = \frac{4 y}{3} a n d y = \frac{3 z}{8}, t h e n ∠ B i s e q u a l t o

△ A B C

a = 2 b

∠ A = 3 ∠ b

A

In a $△ A B C, ∠ A = x^{\circ}, ∠ B = (3 x - 2)^{\circ}, ∠ C = y^{\circ} a n d ∠ C - ∠ B = 9^{\circ}$ .Find the three angles.

If $sin 90^{\circ} - (A + B) = cos x = cos y,$

find the value of $x$ and $y$ ; if $y$ is the angle $C$ of triangle $A B C .$ (In triangle $A B C, ∠ A + ∠ B = 90^{\circ}$ )

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