The Diameter of a Circle is 20 Cm. Taking π = 3.14, Find the Circumference and Its Area.

The diameter of a circle is 20 cm. Taking π = 3.14, find the circumference and its area.

Sum

Diameter of circle (d) = 20 cm

∴ Circumference = dπ = 20 × 3.14 = 62.8 cm

Radius (r) = `"d"/2` = 10 cm

∴ Area of a circle = πr²

= 3.14 × 10 × 10 = 314 cm²

shaalaa.com

Concept of Measurement Using a Basic Unit Area of a Square, Rectangle, Triangle, Parallelogram and Circle, Rings and Combined Figures.

Is there an error in this question or solution?

Chapter 23: Mensuration (Perimeter and Area of Plane Figures) - Exercise 20 (B)

Chapter 23 Mensuration (Perimeter and Area of Plane Figures)
Exercise 20 (B) | Q 27

A square lawn is surrounded by a path 2.5 m wide. If the area of the path is 165 m² find the area of the lawn.

In the figure given below, find the area of shaded region: (All measurements are in cm)

One side of a parallelogram is 20 cm and its distance from the opposite side is 16 cm. Find the area of the parallelogram.

One side of a parallelogram is 18 cm and its area is 153 cm². Find the distance of the given side from its opposite side.

Find the height of a triangle whose base is 18 cm and the area is 270 cm².

Find the area of a right-angled triangle whose hypotenuse is 13 cm long and one of its legs is 12 cm long.

Find the base of a triangle whose area is 360 cm²and height is 24 cm.

The area of an equilateral triangle is (`64xxsqrt3`) cm². Find the length of each side of the triangle.

The diameter of every wheel of a car is 63 cm. How much distance will the car move during the 2000 revolutions of its wheel.