Foundation Mathematics Primary 4 Symmetry

A figure has a vertical line of symmetry. The left half of the figure contains 3 shaded squares. How many shaded squares does the complete symmetric figure have?

A 3
B 5
C 6
D 9
Show Worked Solution

Worked Solution

Step 1: Understand what a line of symmetry does. A vertical line of symmetry reflects every square on the left side to a matching position on the right side. Step 2: Count the shaded squares on the left half. Left half = 3 shaded squares. Step 3: Mirror to find the right half. Right half = 3 shaded squares (one for each on the left). Step 4: Find the total. 3 + 3 = 6 shaded squares in the complete figure.

Correct answer: 6

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