Question

The diagram shows a roundabout at the the junction of four roads (of equal width) the central park is in the form of a circle with centre o and radius 14 m.the curbs bc, de, fg and ha are in the form of arcs that lie on a circle with centre oradius 21 m. the angles subtended by these curbs at o are 60°, 45°, 45°, 90°road 4road 390060°road 1ссroad 2(1) find the total lengths of the curbs;(ii) find the area of he circular road surrounded the central park;35.(iii) cite reasons why traffic roundabout are built.​

Answer 1

Length of curbs =  44 m  area of he circular road surrounded the central park = 770 m²

Step-by-step explanation:

Inner Circle = 14 cm

Outer circle = 21 cm

Area of Circular road = π (21² - 14²)

= (22/7) 35 * 7

= 770 m²

the angles subtended by these curbs at o are 60°, 45°, 45°, 90°

Total angles = (60 + 45 + 45 + 90) = 240°

Length of curbs = (240/360) * π * 21

= (2/3)(22/7) * 21

= 44 m

traffic roundabout are built to minimize wait time at traffic signals

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Answer 2

Answer:

Step-by-step explanation:

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