▶️ Answer/Explanation
Answer:
(a) The equilateral triangle has 3 lines of symmetry (through each vertex to midpoint of opposite side). The rectangle has 2 lines of symmetry (vertical and horizontal through center). The isosceles triangle has 1 line of symmetry (vertical through the apex).
(b) The order of rotational symmetry is 2 – the shape matches itself twice in a full 360° rotation (at 180° and 360°).