In Fig. 2.38,

(a) is AC + CB = AB?

(b) is AB + AC = CB?

(c) is AB + BC = CA?

If two rays intersect, will their point of intersection be the vertex ofan angle of which the rays are the two sides?

In Fig. 2.37,

(a) name any four angles that appear to be acute angles.

(b) name any two angles that appear to be obtuse angles.

In Fig. 2.39.

(a) What is AE + EC?

(b) What is AC – EC?

(c) What is BD – BE?

(d) What is BD – DE?

Using the information given, name the right angles in each part of Fig. 2.40:

(a) BA ⊥BD

(b) RT ⊥ST

(c) AC ⊥BD

(d) RS ⊥RW

(e) AC ⊥BD

(f) AE ⊥CE

(g) AC ⊥CD

(h) OP ⊥AB

Fig. 2.40