How many angles are there in the adjoining figure? Name them.

In the adjoining figure, name the point(s)

(i) in the interior of ∠DOE

(ii) in the exterior of ∠EOF

(iii) on ∠EOF

Draw rough diagrams to illustrate the following:

(i) open simple curve

(ii) closed simple curve

(iii) open curve that is not simple

(iv) closed curve that is not simple

Consider the adjoining figure and answer the following questions:

(i) Is it a curve?

(ii) Is it a closed curve?

(iii) Is it a polygon?