Lines, Triangles, Circles

Name:

Date:

📚 Part 1: WALT, Success Criteria & Quick Check (Multiple Choice)

WALT: identify parallel and perpendicular lines, classify triangles by sides and angles, and name parts of a circle.

Success Criteria: I can point out parallel/perpendicular lines in a shape; I can name equilateral/isosceles/scalene and acute/right/obtuse triangles; I can state radius, diameter and how diameter relates to radius.

Dyslexia-friendly note: Read questions aloud if helpful; highlight key words (parallel, perpendicular, radius, diameter).

1. In a rectangle, which lines are parallel?

The two pairs of opposite sides

The two adjacent sides

The diagonals

No sides are parallel

2. Which description matches perpendicular lines?

Lines that never meet

Lines that meet at a 90° angle

Lines that always cross twice

Lines that are the same length

3. A triangle with all three sides equal is called:

Equilateral

Isosceles

Scalene

Right

4. Which triangle has one 90° angle?

Acute triangle

Right triangle

Obtuse triangle

Equilateral triangle

5. Which statement about a circle is correct?

Diameter = 2 × radius

Radius = circumference

Circumference = diameter + radius

Radius = 2 × diameter

✏️ Part 2: Short Answers & Worked Problems

6. Sketch and label an isosceles obtuse triangle. Explain in one sentence why it is isosceles and why it is obtuse.

7. A circle has radius 5 cm. Calculate:

a) Diameter = ____ cm

b) Approximate circumference using π = 3.14: C = ____ cm

8. Imagine a simple 'house' shape: a rectangle (base) with a triangle roof on top. Answer:

a) Name one pair of parallel sides in the rectangle: ________

b) Name one pair of perpendicular sides (where the rectangle meets the roof): ________

🎯 Part 3: Extension & Reflection (Creative Task)

9. Extension challenge: Design a polygon that includes at least two different sets of parallel lines and at least one perpendicular pair. Sketch your polygon and label one pair of parallel lines and the perpendicular pair.

Differentiation strategies: For learners who need support, provide a square or rectangle template to find parallel/perpendicular sides; use colour-coded labels. For advanced learners, ask them to calculate one interior angle using polygon angle-sum rules.

Extension activities: - Measure real objects at home (e.g., book, lid) to find examples of parallel/perpendicular lines and circles. - Try estimating circumference using string and compare to 3.14 × diameter.