Robert is told the size of angle $\mathrm{BAC}$ in degrees and he is then asked to calculate the length of the line $\mathrm{BC}$. He uses his calculator but forgets that his calculator is in radian mode. Luckily he still manages to obtain the correct answer. Given that angle $\mathrm{BAC}$ is between $10°$ and $15°$, Draw the graph to find the size of angle $\mathrm{BAC}$, correct to $2$ decimal places.

Discuss and explain, with the aid of diagrams, the meaning of Chord.

Discuss and explain, with the aid of diagrams, the meaning of the word 

Arc

Discuss and explain, with the aid of diagrams, the meaning of Segment

Discuss and explain, with the aid of diagrams, the meaning of segment.

Explain what is meant by: Minor are and major arc

Explain what is meant by: Minor sector and major sector.

Explain what is meant by : Minor segment and major segment.

Given that the radius of a circle is $r \mathrm{cm}$ and that the angle subtended at the centre of the circle by the chord $AB$ is $\theta °$, discuss and write down an expression, in terms of $r$ and $\theta$, for finding the following:

Length of minor arc $AB$