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Form 2 Mathematics similarity and enlargement online lessons

Form 2 Mathematics similarity and enlargement online lessons

Lessons (18)

• 1.    Similarity and enlargement: Similar figures
  9m 12s

• 2.    Lesson on enlargement, centre of enlargement and linear scale factor
  12m 15s

• 3.    Finding the center of enlargement
  5m 22s

• 4.    similarity and enlargement lesson on scale factor
  11m 15s

• 5.    Lesson on translation vector
  8m 37s

• 6.    The volume scale factor of two similar cylinders is 27. Find the: (a) linear scale factor. (b) area scale factor.
  0m 37s

• 7.    The corresponding sides of two similar blocks of wood measure 15 cm and 3 cm. Find the ratio of their volumes.
  0m 51s

• 8.    A spherical balloon 5 cm in diameter is inflated so that its diameter is 10 cm. By what factor has the volume increased?
  0m 39s

• 9.    The corresponding lengths of two similar iron bars are 5 cm and 15 cm. (a) Find the ratio of their masses. (b) If the smaller iron bar has a mass of 12 kg, determine the mass of the large bar.
  1m 10s

• 10.    A spherical solid lid oil diameter 12.0 cm weighs 6.4 kg. Calculate the mass of a similar solid of a diameter 10.0 cm.
  1m 32s

• 11.    The heights of two similar pails are 12 cm and 8 cm. The larger pail can hold 2 litres. Find the capacity of the smaller pail.
  1m 5s

• 12.    The mass of fat in two similar tins are 2 000 g and 500 g respectively, If the area of the base of the smaller tin is #100 cm^2#, find the area of the base of the larger tin.
  1m 49s

• 13.    A soft drink manufacturing company makes a giant model bottle 2 m long as the factory symbol. If the real bottle from the factory is 20 cm long and has a volume of 300 #cm^3#, find the volume of the model in #cm^3#.
  1m 48s

• 14.    The shortest side of a triangle is 12 cm and the area of the triangle is 8 #cm^2#. A similar triangle has an area of 18 #cm^2#. Calculate the shortest side of this triangle.
  1m 2s

• 15.    The volumes of two similar cans are 96 #cm^3# and 1 500 #cm^3#. Find the ratio of: (a) their heights. (b) the area of their curved surfaces. .
  1m 19s

• 16.    The radius of a soap bubble increases by 4%. Calculate the percentage increase in its: (i) surface area. (ii) volume (to three significant figures).
  2m 13s

• 17.    The corresponding sides of two similar figures measure 16 cm and 24 cm respectively. Calculate the ratio of: (a) their perimeters. (b) their areas.
  0m 55s

• 18.    In figure below, VAB, VCD and VEF are similar cones. Their radii are 14 cm, 10.5 cm and 7 cm respectively. If the height of VAB is 42 cm, calculate: (a) the heights of the cones VCD and VEF. (b) (i) the ratio of the curved surface areas of cones VCD and VEF. (ii) the ratio of their volumes.
  2m 53s