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.

Step1:Draw circles of radius 4 and 6 cm

Step 3: Draw tangent to inner circle from C

AD is perpendicular to DC- tangent and radius

In Δ ADC

AC is radius

AC² = AD² + DC²

6² = 4² + DC²

36 = 16 + DC²

DC² = 20

DC = 2 cm