Perimeter and area

1. Find the area of a rectangular field 40 m by 25 m.
2. Find the perimeter of the same field, then the cost to fence it at $3/m.
3. A circle has radius 7 cm. Find its area and circumference (π = 22/7).
4. A trapezium has parallel sides 8 cm and 12 cm, height 5 cm. Find its area.

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