Question

the longest chord of a circle is 21 cm. find its radius and also find the area of the circle​

Answer 1

Answer:

longest cord = diameter

So radius=21/2

Area of circle=22/7 × 21/2 ×21/2

=33 × 21/2

= 346.5 cm²

Answer 2

Answer:

346.5 cm²

Step-by-step explanation:

Longest chord= diameter

So, radius = 21÷2=10.5

so, area = πr²

= 22/7 × 10.5

= 346.5 cm²