In each of the following figure, O is the centre of the circle. Find the size of each lettered angle :

Solution:
More Solutions:
- Construct a quadrilateral ABCD such that AB = 5 cm, BC = 4·2 cm, AD = 3·5 cm, ∠A = 90°, and ∠B = 60°
- Construct a quadrilateral BEST where BE = 3.8 cm, ES = 3.4 cm, ST = 4.5 cm, TB = 5 cm and ∠E = 80°.
- Construct a parallelogram ABCD such that AB = 5 cm, BC = 3·2 cm and ∠B 120°.
- Construct a parallelogram ABCD such that BC = 4·5 cm, BD = 4 cm and AC = 5·6 cm.
- Construct a rectangle whose adjacent sides are 5·6 cm and 4 cm.