Advertisements
Advertisements
प्रश्न
Find the length of the diagonal of a square whose area is `128 cm^2` Also, find its perimeter.
उत्तर
Area of the square= `128 cm^2`
Area =` 1/2 d^2` (where d is a diagonal of the square)
⇒` 128=1/2 d^2`
⇒` d^2=256`
⇒`d=16 cm`
Now,
`Area= "Side^2"`
⇒` 128= "side"^2`
⇒`" Side"= 11.31 cm`
Perimeter= `4` (side)
=`4(11.31)`
=`45.24 cm`
APPEARS IN
संबंधित प्रश्न
The perimeter of a rectangular plot of land is 80 m and its breadth is 16 m. Find the length and area of the plot.
The dimensions of a room are 14 m x 10 m x 6.5 m There are two doors and 4 windows in the room. Each door measures 2.5 m x 1.2 m and each window measures 1.5 m x 1 m. Find the cost of painting the four walls of the room at ₹ `35perm^2` .
In the given figure, the side of square is 28 cm and radius of each circle is half of the length of the side of the square where O and O' are centres of the circles. Find the area of shaded region.
How many revolutions a circular wheel of radius r metres makes in covering a distance of s metres?
If the difference between the circumference and radius of a circle is 37 cm, then its area is
In the given figure, PSR, RTQ and PAQ are three semicircles of diameter 10 cm, 3 cm and 7 cm respectively. Find the perimeter of shaded region. [Use π= 3.14]
The cost of fencing a circular field at the rate of Rs 25 per metre is Rs 5500. The field is to be ploughed at the rate of 50 paise per m2 . Find the cost of ploughing the field. [Take `π =22/7`].
A racetrack is in the form of a ring whose inner circumference is 352 m and outer circumference is 396 m. Find the width and the area of the track.
The diameters of two circles are 32 cm and 24 cm. Find the radius of the circle having its area equal to the sum of the areas of the two given circles.
The diameter of a wheel is 0.70 m. Find the distance covered by it in 500 revolutions. If the wheel takes 5 minutes to make 500 revolutions; find its speed in :
(i) m/s
(ii) km/hr.
