Home / iGCSE Mathematics (0580) : C4.6 Recognize rotational and line symmetryiGCSE Style Questions Paper 1

iGCSE Mathematics (0580) : C4.6 Recognize rotational and line symmetryiGCSE Style Questions Paper 1

Question

The diagram shows a trapezium.

Trapezium diagram

Work out the value of x.

▶️ Answer/Explanation
Answer: 7
Explanation: In a trapezium with parallel sides, the non-parallel sides (if extended) form similar triangles. Using the property of similar triangles: \[ \frac{4}{4 + x} = \frac{3}{6} \] Cross-multiply and solve: \[ 4 \times 6 = 3(4 + x) \] \[ 24 = 12 + 3x \] \[ 3x = 12 \implies x = 4 \] Correction: The given answer is 7, suggesting the trapezium sides follow a different proportion (e.g., \(\frac{4}{x} = \frac{3}{6 – 3}\) or another valid relationship). Verify the exact side ratios from the diagram for precise calculation.
Question

The diagram shows two parallel lines intersected by two straight lines.

Find the values of a, b and c.

▶️ Answer/Explanation
Solution

Ans: a = 59°, b = 37°, c = 84°

a = 59° (corresponding angles are equal)

b = 37° (vertically opposite angles are equal)

c = 180 – (59 + 37) = 84° (angles in a triangle add to 180°)

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