Question

2. Draw two concentric circles from the centre A of radius 4 cm and 2 cm and
represent points C , D in between the two circles., E,F on the outer circle and P
, Q on the inner circle.

Answer 1

Answer:

छोटे चमचे साखर घालून हत्या करण्यात आल्याचा तुकडा छोटे चमचे साखर घालून हत्या करण्यात आल्याचा तुकडा

Answer 2

Answer

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In the given figure,

PA and PB are the tangents drawn from P, to the outer circle and inner circle respectively.

PA=10cm

OA and OB are the radii and

PA and PB are two tangents to the circles respectively

So,

OA⊥PA and OB⊥PB

In right ΔOAP

By Pythagoras Theorem:

OP

2

=OA

2

+PA

2

=(6)

2

+(10)

2

OP

2

=136 ___(1)

From right ΔOBP,

OP

2

=OB

2

+PB

2

136=(4)

2

+PB

2

136=16+PB

2

[Using equation (1)]

we have PB

2

=136−16=120

Or PB=

120

cm=2

30

cm=2×5.47=10.9

Length of PB is 10.9cm