[" Int and it is perpendiate "1." Draw a circle of radius of the rentre their lengths."],[" aw a tangent at apents to the circle and measure their from a point on the concentric circle of "],[" a line perpendiculst a tangent to a circle of radius "4cm" from a point on the ctual calculation."],[" a line perpendiculsti a tangent to a circle of radius "4" lso verify the measurement by actual calculation."],[" ent at the point."]