9. In the given figure, find the value of ∠ABC.
A
(2 X2 + 1)
(3X2 + 1 + 2X) (3X + 6)
D B C
OR
In a parallelogram ABCD, if AB = y + 1, CD = 2 x + 5, AD = y + 5 and BC = 3x – 4.
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Answer:
In parallelogram, opposite sides are parallel and equal
∴AB=CD and AD=BC
⇒2x+5=y+1⟶1
⇒3x−4=y+5⟶2
Equation 2-equation 1
(3x−2x)−4−5=0+4
x=13
Put value of x in 1
2(13)+5−1=y
y=30
BC
AB
=
3x−4
2x+5
=
3(13)−4
2(13)+5
BC
AB
=
35
31
∴AB:BC=31:35
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