# Form 2 Mathematics similarity and enlargement online lessons

Form 2 Mathematics similarity and enlargement online lessons

Lessons (**18**) * SHARE*

- 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

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