Page 27 - RME-Based Bilingual E-Module

LEARNING ACTIVITIES 1

Activities 1.5 Examples

Let’s Learn!

Problem of Cylinder Surface Area

A tennis ball can contains 3 balls with 6 cm of diameter.
Calculate the surface area of the tennis ball can?

Solution:
Known : d = 6 cm  r = ½ d = ½ x 6 = 3 cm
Height = h = 3 x Diameter = 3 x 6 = 18 cm
Asked : Surface Area of Can

Answer : Surface Area of Can = 2  r (h + r)
= 2 x 22/7 x 3 (18 + 3)
= 132/7 x 21

= 396 cm
2
So, surface area of can is 396 cm .
2

Problem of Cylinder Volume
A can of butter is cylinder with 15 cm of height and 6 cm of
radius. If the butter in the can is full, calculate the net weight

of butter in grams? (If 1 cm = 0,9 gram)
3

Solution:

Known : r = 6 cm, h = 15 cm
3
1 cm = 0,9 gram
Asked : Net Weight of BUtter
Answer : Volume of Cylinder = Base Area x Height

=  r h
2
= 3,14 x 6 x 6 x 15
= 1.695,6 cm
3
Net weight of butter is 1.695,6 x 0,9 = 1526,04 gram  1,53 kg.

RME-BASED BILINGUAL E-MODULE— 7