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 diagonals of rhombus are perpendicular to each other.
So AC ⊥ BD and E is their point of intersection.
(f) ∠ AEC because AE ⊥ CE as diagonals of rhombus are perpendicular to each other.
(g) ∠ ACD because AC ⊥ CD
(h) ∠ AKO, ∠ AKP, ∠ BKO and ∠ BKP because OP ⊥ AB and K is their point of intersection.
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