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Nodal Theory

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## Quiz of the Month (October 2004)

### Hector C. Parr

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#### SOLUTION TO LAST MONTH'S QUIZ

```   1.  2413 cm2
2.  192 cm
3.  356.2 cm
```

Notes
``` 1.  Area of one step = (PI*1042 - PI*402) / 12

2.  MA2 = 1042 - 402 (etc.)

3.  The PLAN diagram will be identical with that for Q.2.
The ELEVATION shows that the vertical height of B
above A is 15 step thicknesses, i.e. 300 cm.
So AB2 = 3002 + 1922 (etc.)```

#### THIS MONTH'S QUIZ

1. If AB = 16 cm, BC = 18 cm and CA = 19 cm and A, B and C are the centres of the three circles, find their radii.

2. If DE = 31 cm, EF = 36 cm, FG = 40 cm, GH = 43 cm and HD = 36 cm find the radii of the five circles.

3. If IJ = 1.8 cm, JK = 2.1 cm, KL = 2.1 cm, LM = 2.5 cm and MN = 2.8 cm, find the length of NI.

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