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57) A roundabout consists of a carriageway with a width of 4.5 meters and a circular inner area with a diameter of 16 meters.

a) There is a fence around the inner area. How many meters is the length of the fence? Round to two decimal places.

b) The inner area is sown with grass. 25 grams of grass seed is needed per m². Calculate how many kg of grass seed is needed for the indoor area. Round to one decimal place.

c) Calculate the area of the carriageway on the roundabout in m². Round to one decimal place.

d) In the case of road works, a white line will be placed in the middle of the carriageway of the roundabout. The striping car travels at a speed of 25 cm per second. How many minutes does it take to apply the line? Round to wholes.​

Sagot :

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