Construct a tangent to a circle of radius 4 cm from a point on the concentric circle of radius 6 cm and measure its length. Also verify the measurement by actual calculation.
Given:
Radii of two co-centric circles.
To do:
We have to construct a tangent of the circle with radius 4 cm from a point on the co-centric circle of radius 6 cm.
Solution:
Steps of construction:
1. Draw two concentric circle with centre O and radii 4 cm and 6 cm Take a point P on the outer circle and then join OP
2. Draw the perpendicular bisector of OP. Let the bisector intersects OP at M
3. With M as the center and OM as the radius, draw a circle. Let it intersect the inner circle at A and B.
4. Join PA and PB.
Therefore, PA and PB are the required tangents.
In $\triangle OAP$,
$OP^2=OA^2+AP^2$
$6^2=OA^2+4^2$
$OA^2=36-16$
$OA=\sqrt{20}$
$OA=2\sqrt5\ cm$
Similarly,
$OB=2\sqrt5\ cm$
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