Construct tangents to a circle of radius 4 cm from a point on the concentric circle of radius 7 cm.

Steps of construction:

1. Draw a circle of radius 4cm with centre O.

2. Draw concentric circle of radius 7cm, with centre O.

3. Mark point P on the larger circle.

4. Make perpendicular bisector of PO and let M be the midpoint of PO.

5. Taking M as centre and MO as radius, draw a circle.

6. The circle intersect at points Q and R.

7. Join P to Q and P to R

∴ PQ and PR are the required tangents.