Question

which letter in the word happy has an order 2 rotational symmetry? h a p y

Explanation:

Rotational symmetry of order 2 means that when the letter is rotated by \(180^{\circ}\), it looks the same as the original.

• For the letter \(H\): When rotated \(180^{\circ}\), it still looks like an \(H\).
• For the letter \(A\): When rotated \(180^{\circ}\), it does not look like an \(A\) anymore.
• For the letter \(P\): When rotated \(180^{\circ}\), it does not look like a \(P\) anymore.
• For the letter \(Y\): When rotated \(180^{\circ}\), it does not look like a \(Y\) anymore.

Answer:

H.