Question

if the circumference of a circle 22cm find its diameter
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Answer 1

Answer:

Let the radius of the circle be r cm

Then circumference =2πr

∴2πr=22

2× ×r=22

r=22 × =3.5cm

∴ Radius of the circle =3.5cm

Area of the circle πr2=(722×27×27)cm2

=38.5cm2

Area of the semi circle =21πr2

=21×38.5=19.25 cm2

Answer 2

Answer:

The diameter will be 7 cm

Step-by-step explanation:

Here the circumference of the circle is given to be 22 cm

We will first find the radius of the circle

circumference of circle = 2πr

                                 22 = 2 × (22/7) × r

                                    r = 7/2

                                    r = 3.5 cm

Now, we have to find the diameter

diameter = 2 × radius

               = 2 × 3.5

               = 7 cm