HOME

TREATISE:
. Quantum
Nodal Theory

ROMALDKIRK:
. Village
. Reservoirs

ESSAYS: COSMOLOGY
. Infinity
. Universe
. Dark Matter

ESSAYS: PHILOSOPHY
. Free Will
. Representation
. Conditionals
. Postscript

ESSAYS: ORGAN MUSIC
. Practising
. British Organs
. Hymn Playing
. Music Lovers

QUIZ QUESTIONS
. Quiz Archive

SERVICES
. Book Reviews

## Quiz of the Month (June 2007)

### Hector C. Parr

***

#### SOLUTION TO LAST MONTH'S QUIZ

```   1.  2.16 cm2
2.  1.68 cm2
3.  0.64 cm2```

Notes.
```  In triangle ABF, AF = 5 (Pythag.)
Triangle AJE is similar to triangle ABF
So AJ/AE = AB/AF = 4/5
So AJ = 2.4
Similarly AK = 3.2
and EJ = 1.8
and BK = 2.4
(etc.)```

#### THIS MONTH'S QUIZ

A warning sign in the form of an equilateral triangle stands vertically on level ground with its base aligned due East-West. Find the three angles of the triangle formed by the sign's shadow in the following cases:

1. When the sun is due South at an altitude of 60o.

2. When the sun is due South-West at an altitude of 45o.

***