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Appendix C

# Math Self-Test Solutions

Score 4 points for each correct answer. For an assessment of your total, read the part before the start of the test.

Use the following if you need to (some are approximations): sin 30° = cos 60° = 0.5, sin 45° = cos 45° = 0.707, sin 60° = cos 30° = 0.866, π = 3.141, 2 = 1.414, 3 = 1.732.

The first seven questions refer to Figure C.1(a).

Figure C.1:

(a) Circle of unit radius (b) Right-angled triangle (c) Two circles of unit radius.

1. What is the equation of the circle?

Answer: Generally, the equation of a circle on the xy-plane centered at (a, b) and of radius r is

${\left(x-a\right)}^{2}+{\left(y-b\right)}^{2}={r}^{2}$

So the ...

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