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As shown in the picture is a rectangular grassland, 16 meters long and 12 meters wide, with a road 2 meters wide in the middle. Calculate the area of grassland (shadow part)
The total length of the road is (16 + 12-2) meters, that is 26 meters. The area of the road is 26 × 2 = 52 (square meters), and the area of grassland is 16 × 12-52, = 192-52, = 140 (square meters). A: the area of grassland is 140 square meters
In a parallelogram grassland, there is a path 8 meters long and 1 meter wide
(20-1) × 8 = 19 × 8, = 152 square meters; a: the area of grassland is 152 square meters
In a rectangular grassland with a length of 50 meters and a width of 30 meters, there is a curved path with a width of 1 meter. How about the area of grassland?
The curved one meter wide path is divided into numerous small parallelograms, which can be regarded as a rectangle. Therefore, the area of the path is: 50 × 1 = 50m & sup2;, or 30 × 1 = 30 & sup2
Then, the area of grassland is:
50×30-50=1450m²
Or: 50 × 30-30 = 1470m & sup2;
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