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Candle Geometry Activity Cards

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Candle Geometry Activity Cards

A candle studio needs help checking shapes, angles and capacity before making a new collection. Solve the 10 activity cards. Use π ≈ 3.14 where needed, and include units in your answers.

Card Set A: Shape Detectives

Use these descriptions of geometric solids: a cylinder has two circular faces and one curved surface; a cone has one circular base and one curved surface; a sphere has one curved surface and no flat faces. A rectangular prism has six rectangular faces: three pairs of equal rectangles. It has 12 edges and 8 vertices.

1.A pillar candle has the shape of a rectangular prism. How many faces, edges and vertices does this solid have?
2.A tea-light candle is shaped like a cylinder. It has a radius of 2.5 cm. What is its diameter?
3.A taper candle is modelled by a cone. Which part of the cone is its pointed tip called?
  • Apex
  • Radius
  • Curved surface
  • Diameter

Card Set B: Angles in the Studio

Classify angles as acute (less than 90°), right (exactly 90°), or obtuse (greater than 90° and less than 180°).

4.A designer sketches a flame with an angle of 38° at its base. Classify the angle.
  • Acute
  • Right
  • Obtuse
5.A gust turns a flame from 25° to 112°. How many degrees did it turn, and is its final angle acute, right or obtuse?
6.Draw two rays that meet to form a 135° angle. Label the angle and classify it.

Card Set C: How Much Wax?

Use these formulas to estimate candle capacity: rectangular prism V = length × width × height; cylinder V = π × radius² × height; cone V = ⅓ × π × radius² × height. Give volume in cubic centimetres (cm³).

7.A rectangular-prism candle is 8 cm long, 5 cm wide and 12 cm high. Find its volume.
8.A cylindrical candle has radius 3 cm and height 10 cm. Find its volume using π ≈ 3.14.
9.A cone-shaped candle has radius 3 cm and height 10 cm. Find its volume using π ≈ 3.14.
10.A cylinder mould and a cone mould both have radius 3 cm and height 10 cm. Which holds more wax, and how much more? Use the answers from Cards 8 and 9.
11.Explain why a cone with the same base radius and height as a cylinder holds less wax. Use a volume relationship in your explanation.

3 printable pages

  • Candle Geometry Activity Cards, page 1 of 3: Card Set A: Shape Detectives, Card Set B: Angles in the Studio

    Page 1

  • Candle Geometry Activity Cards, page 2 of 3: Card Set C: How Much Wax?

    Page 2

  • Candle Geometry Activity Cards, page 3 of 3: 10. A cylinder mould and a cone mould both have radius 3 cm and height 10 cm. Which holds…

    Page 3

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