Question

Find the circumference and area of the circle with following radii.
(a) 35 cm
(b) 21 mm
(c) 6.3 m
(d) 28 cm
A wall piece has 6 semicircles attached to a regular polygon of 6 sides. If perimeter of the polygon
480 cm. Find the area of covered by the semicircles.
the field​

Answer 1

Answer:

Step-by-step explanation:

Circumference of circle: The distance around the circular region is called its circumference. The ratio of circumference of any circle to its diameter is constant. This constant is denoted by π and is read as pie.

Circumference/Diameter = Pie

i.e., c/d = π   or   c = πd

We know that diameter is twice the radius, i.e., d = 2r

   C = π × 2r

⇒ C = 2πr

Therefore approximate value of π = 22/7 or 3.14.

Answer 2

Answer:

find the circumference and area of the circles with following radii.b) 21 mm