Copy and complete these sentences to give the definitions of the terms shown in the diagram above. 

a. A line that is always the same distance from a single fixed point is called a____. 

b. The perimeter of a circle is called its ____. 

c. A straight line from the centre of a circle to the circumference of the circle is called a____. The plural of the word is ____. 

d. A straight line across a circle which starts and ends at two points on the circumference is called a____. 

e. A chord which passes through the centre of a circle is called a____. 

f. A line which forms part of the circumference of a circle is called an____. 

g. The area enclosed by two radii and an arc is called a____. 

h. The area enclosed by an arc and a chord is called a____. 

i. A straight line which touches the circumference of a circle is called a____. 

j. The angle between a radius and a tangent to a point on the circumference is____.