Sheet #31

1. 01

   ReferenceBasketball24.2 cm

   To size upTennis ball6.7 cm

   Measured Diameter of a regulation tennis ball

   Rules require a diameter between 6.54 and 6.86 cm.

2. 02

   ReferenceCity bike1.75 m

   To size upFire engine10 m

   Measured Length of a fire engine

   A fire engine usually carries 2,000 to 3,000 litres of water.

3. 03

   ReferenceHorse1.6 m

   To size upSaguaro cactus12 m

   Measured Height of a mature saguaro cactus

   It can live over 150 years and grows its first arms only after about 50.

4. 04

   ReferenceMotorcycle2.1 m

   To size upUSB flash drive6 cm

   Measured Length of a common USB flash drive

   A 1 TB drive holds the equivalent of more than 1,400 CD-ROMs.

5. 05

   ReferenceWind turbine150 m

   To size upBlue whale24 m

   Measured Length of an adult blue whale

   It is the largest animal known to have ever lived.

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