Similar Figures

This problem is meant for those who understand geometrical similarity.

Answer the following two questions:

1) Are the two triangles in the picture similar?

2) Are the outer and inner rectangles of the picture frame similar?

The Height of a Tower

There is a very big tower in your town, but you do not know its height. You have, however, a photograph of the tower.

Can it help you to find the real height?

Two Watermelons

A man is selling two watermelons. One is one-quarter bigger than the other, but costs one and a half times more. Which one would you buy?

A Brick

A regular-size brick weighs 4 kilogrammes.
How much will a similar toy brick, four times smaller but made of the same material, weigh?