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

A right angle is an angle of measure 90°. It is formed by two perpendicular lines.

(a) ∠ ABD because BA ⊥ BD

(b) ∠ RTS because RT ⊥ ST

(c) ∠ ACD and ∠ ACB because AC ⊥ BD

(d) ∠ RTW and ∠ RTS because RT ⊥ SW

(e) ∠ AED, ∠ AEB, ∠ BEC and ∠ DEC because AC ⊥ BD and E is their point of intersection.

(f) ∠ AEC because AE ⊥ CE

(g) ∠ ACD because AC ⊥ CD

(h) ∠ AKO, ∠ AKP, ∠ BKO and ∠ BKP because OP ⊥ AB and K is their point of intersection.