Advertisements
Advertisements
प्रश्न
The perimeter of a semicircular plate is 108 cm. find its area.
Advertisements
उत्तर
The perimeter of a semi-circular plate = 108 cm
⇒ πr + 2r = 108 ...(r is radius of a circle )
⇒ r ( π + 2 ) = 108
⇒ r = ` (108)/( π + 2) = (108)/(22/7 + 2) = (108 xx 7) / (36) = 21 "cm"`
Now, area of a semi-ccircular pleate = `[πr^2]/2 = [22/7 xx 21 xx 21]/2 = 693 "cm"^2`
APPEARS IN
संबंधित प्रश्न
The diagonal of a quadrilateral shaped field is 24 m and the perpendiculars dropped on it from the remaining opposite vertices are 8 m and 13 m. Find the area of the field.
The diagonal of a rectangular plot is 34 m and its perimeter is 92 m. Find its area.
A rectangular plot of land measures 45 m x 30 m. A boundary wall of height 2.4 m is built all around the plot at a distance of 1 m from the plot. Find the area of the inner surface of the boundary wall.
Trapezium given below; find its area.
The perimeter of a rectangular field is `3/5`km. If the length of the field is twice its width; find the area of the rectangle in sq. meters.
How many tiles, each of area 400 cm2, will be needed to pave a footpath which is 2 m wide and surrounds a grass plot 25 m long and 13 m wide?
Sum of the areas of two squares is 400 cm2. If the difference of their perimeters is 16 cm, find the sides of the two squares.
Vertices of given triangles are taken in order and their areas are provided aside. Find the value of ‘p’.
| Vertices | Area (sq.units) |
| (p, p), (5, 6), (5, –2) | 32 |
In the following, find the value of ‘a’ for which the given points are collinear
(a, 2 – 2a), (– a + 1, 2a) and (– 4 – a, 6 – 2a)
Find the area of quadrilateral BCEG
