## 51. The adjoining figure contains three squares with areas of 100, 16 and 49 lying side by side as shown. By how much should the area of the middle square be reduced in order that the total length PQ of the resulting three squares is 19 ?

## 52. The three sides of a triangular field are 20 metres, 21 metres and 29 metres long respectively. The area of the field is :

## 53. The diagonal of a square is $$4\sqrt 2 $$ cm. The diagonal of another square whose area is double that of the first square, is :

## 54. What will be the area of 4 metres high wall on all four sides of a rectangular hall having perimeter 64 m ?

## 55. The altitude of an equilateral triangle of side $$2\sqrt 3 $$ cm is :

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