CIRCLE THEOREMS Welcome to your CIRCLE THEOREMS In the following diagram, O is the centre of the circle. AB and BC are the tangents to the circle. Find the length of BC. 4 cm 7 cm 8 cmIn the following diagram, O is the centre of the circle. ABCD is a rectangle. Calculate the value of y in the following diagram. 50° 60° 30°Find the value of angle z in the following diagram. 20° 30° 40°Find the value of angle t in the following diagram. 30° 60° 90°In the following diagram, what is the angle ABC? 42° 84° 45°What is the value of angle a in the following diagram? 24° 96° 48°Find the value of angle x in the following diagram. 108° 27° 54°What is the value of angle b? 62° 31° 124°What is the value of angle c? 62° 31° 124°What is the value of angle BCD? 95° 108° 102°What is the value of angle ADC? 95° 108° 102°In the following diagram, BC is a tangent to the circle. O is the centre of the circle. What is the value of angle COB? 65° 75° 45°In the following diagram, O is the centre of the circle. BC is a tangent to the circle. If AC=AB, what is the angle ABC? 90° 45° 60°Find the angle marked s in the following diagram. 90° 60° 30°Find the angle marked x in the following diagram. 60° 120° 150°