Advertisements
Advertisements
प्रश्न
There is a path of uniform width 7 m round and outside a circular garden of diameter 210 m. Find the area of the path.
उत्तर
Diameter = 210 m
Radius of inner circle r2 = 105 m
Width = 7m
Radius of outer circle r1 = 105 + 7 = 112 m
∴ Area of path = `pir_1^2 - pir_2^2`
= `pi[r_1^2 - r_2^2]`
= `22/7(r_1 + r_2)(r_1 + r_2)`
= `22/7 (112 + 105)(112 - 105)`
= `22/7 xx 217 xx 7`
= 4774 m2
APPEARS IN
संबंधित प्रश्न
The area of a square filed is 8 hectares. How long would a man take to cross it diagonally by walking at the rate of 4 km per hour?
In the following figure, shows the cross-section of railway tunnel. The radius OA of the circular part is 2 m. If ∠AOB = 90°, calculate:
the perimeter of the cross-section
What is the area of a sector of a circle of radius 5 cm formed by an arc of length 3.5 cm?
If the area of a square is same as the area of a circle, then the ratio of their perimeters, in terms of π, is
Find the areas of both the segments of a circle of radius 42 cm with central angle 120°.
In the given figure, the sectors of two concentric circles of radii 7 cm and 3.5 cm are shown. Find the area of the shaded region.
The given figures show a rectangle ABCD inscribed in a circle as shown alongside.
If AB = 28 cm and BC = 21 cm, find the area of the shaded portion of the given figure.
Find the area of the segment shown in Fig. 2, if the radius of the circle is 21 cm and ∠AOB = 120° `( "Use" π = (22)/(7))`
The area of the circle is 154 cm2. The radius of the circle is ______.
It is proposed to build a single circular park equal in area to the sum of areas of two circular parks of diameters 16 m and 12 m in a locality. The radius of the new park would be ______.
