Advertisements
Advertisements
प्रश्न
Find the area and perimeter of the following semicircles: Diameter = 5.6cm
Advertisements
उत्तर
The radius of a Circle with diameter d is r = `"d"/(2)`
The Area of a Semi-circle with radius r = `(pi"r"^2)/(2)`
The Perimeter of a Semi-circle with radius r
= πr + 2r
= r(π + 2)
= `"r"(22/7 + 2)`
= `(36)/(7) xx "r"`
The radius of a Circle with diameter 5.6 is r
= `(5.6)/(2)`
= 2.8cm
The Area of a Semi-circle with radius 2.8
= `(pi(2.8)^2)/(2)`
= 12.32cm2
The Perimeter of a Semi-circle with radius r
= π x 2.8 + 2 x 2.8
= 2.8(π + 2)
= `2.8(22/7 + 2)`
= `(36)/(7) xx 2.8`
= 14.4cm.
APPEARS IN
संबंधित प्रश्न
The minute hand of a clock is √21 𝑐𝑚 long. Find area described by the minute hand on the face of clock between 7 am and 7:05 am
The parallel sides of trapezium are 12 cm and 9cm and the distance between them is 8 cm. Find the area of the trapezium.
A square ABCD is inscribed in a circle of radius r. Find the area of the square.
The circumference of a circle is 39.6 cm. Find its area.
In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. The length of the arc is
Find the area and perimeter of the circle with the following:
Diameter= 35 cm
The diameter of a wheel is 1.4m. How many revolutions does it make in moving a distance of 2.2 kms?
Find the diameter of the sphere for the following :
Volume = `523 17/21` cm3
The cost of fencing a circular field at the rate of ₹ 240 per meter is ₹ 52,800. The field is to be ploughed at the rate of ₹ 12.50 per m2. Find the cost of pouching the field.
If the circumference of a circle is 82π, then the value of ‘r’ is
