2.1 Modern measuring instuments  (Page 2/3)

Write down the answers next to the right numbers.

Assignment 9:

Drawing a figure

[lo 1.2]

Answer the following questions by writing down only the name of the correct geometric figure.

1. Which figure has four right angles each?
2. Which figure’s four sides are of equal length?
3. Which figure has two pairs of equal sides?
4. Which figures’ opposite sides are parallel?
5. Which figure has three acute angles?
6. Which figure has no angles?
7. Calculate the CIRCUMFERENCE of each figure in mm

(i)

(ii)

(iii)

(iv) (Hint: Use a length of wool.)

h. Use your pencil and a square grid (p. 15) and draw:

1. a square with a circumference of 160 mm;
2. a square of which each of the sides is 50 mm;
3. a rectangle of which the length is 30 mm and the breadth is 50 mm;
4. a triangle of which one side is 40 mm and two sides are 30 mm each;
5. a circle (without the grid).

(HINT: Here you may use any aid, or you may use a pair of COMPASSES.)

Background:

What is a pair of compasses?

The following parts of a circle are important: the centre, the radius and the diameter.

If you know the length or the radius or diameter of a circle, it is easy to draw a circle

with a set of compasses.

Assignment 10:

Draw circles with a set of compasses

[lo 1.8]

a. A circle with a diameter of 100 mm

b. A circle with a radius of 30 mm

Remember:

A set of compasses is not a toy and it could be dangerous if you don’t handle it with care.

Assignment 11:

Using a ruler and a pencil, re-draw the top design on squared paper

[lo 1.7]

Assignment 12:

Proportion

[lo 1.8]

Try to re-draw the sketch in Assignment 11 on a clean page.

NB: All drawings must be done in pencil.

SELF-assessment of measuring and drawing with measuring-instruments

S elf-assessment

1. The learner’s performance does not meet the requirement of the LO.
2. The learner’s performance partially meets the requirement of the LO.
3. The learner’s performance meets the requirement of the LO.
4. The learner’s performance exceeds the requirement of the LO.

Assignment 13:

When you receive a copy of the assignment grid, make a tick under the appropriate number