Question

In a circle of radius 12cm a chord is drawn 3cm from the centre. Find the angle subtended at the centre

Answer 1

draw the diagram

the distance (3 cm) divided by the radius (12 cm)
... is the cosine of half the subtended angle

Answer 2

Answer

Answer 3

Work

Answer 4

Find the angle subtended at the center of a circle of radius 6.2cm by an arc of length 18.5cm