Question

Description: Construct the sketch of a house by using given geometrical shapes as per the given dimensions.

1. A square of side 4 cm.

2. An equilateral triangle of side 4 cm.

3. A parallelogram of base 6 cm.

4. A rectangle of 6 cm x 4 cm​

Answer 1

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In order to calculate the surface area of a torus you need to find two radius values.

The large or major radius (R) is measured from the middle of the hole to the middle of the ring.

The small or minor radius (r) is measured from the middle of the ring to the outside edge.

The diagram shows two views of an example torus and how to measure its radiuses (or radii).

The calculation to find the surface area is in two parts (one for each radius). The calculation is the same for each part.

The formula is: surface area = (2πR)(2πr)

To work out the surface area of the example torus.

(2 × π × R) = (2 × 3.14 × 20) = 125.6

(2 × π × r) = (2 × 3.14 × 4) = 25.12

Multiply the two answers together to find the total surface area of the example torus.

125.6 × 25.12 = 3155.072cm².

Answer 2

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