Is the circumference of two circles are in the ratio 4 is to 9 then the ratio in their area is?

Thus, the required “option 2) 16 : 81 is correct”.

What is the ratio of the circumferences of the two circles?

The circumference of a circle is given by 2*pi*r. Multiply R1 and R2 by 2*pi, we get 2*pi*R1 : 2*pi*R2 = 1:5. Therefore the circumference of the two circles is in the ratio 1:5.

What is the ratio of area of two circles?

As area of a circle is πr(r) where r is radius. Let us take the radii of the circles as r and x. Now, ratio of areas = 49:64 = πr(r):πx(x) = r(r):x(x) = r:x = 7:8. Ratio of circumference = 2πr:2πx = r:x = 7:8.

What is the ratio of the circumferences?

Pi
Circles are all similar, and “the circumference divided by the diameter” produces the same value regardless of their radius. This value is the ratio of the circumference of a circle to its diameter and is called π (Pi).

For what value of r the area and the circumference of circle are equal?

Answer: The value of radius would be 2 units.

How does circumference relate to area?

The area of a circle is given by the formula A = π r2, where A is the area and r is the radius. The circumference of a circle is C = 2 π r. Now we use this to replace r in the first equation: A = π [ C / (2 π ) ]2. When we simplify this, we get A = C2 / (4 π).

How do you find a ratio of 4 9?

So, 4 : 9 is an equivalent ratio of 8 : 18. Therefore, the two equivalent ratios of 8 : 18 are 16 : 36 and 4 : 9.

What is the ratio of 9 4?

Ratio 4:9 is also 49 . This ratio is in reduced form (no whole can be divided into both evenly).

What is the value of circumference of circle?

the formula for circumference of a circle is 2 x pi x r(radius).

What is the ratio between the areas of two circles?

The areas of two circles are in the ratio 4 : 9. What is the ratio between their circumferences? – Sarthaks eConnect | Largest Online Education Community The areas of two circles are in the ratio 4 : 9. What is the ratio between their circumferences? Login Remember Register Test JEE NEET Home Q&A Unanswered Ask a Question Learn Ask a Question

How do you find the radius of a circle with two circles?

(1.) r₁/r₂ = 3/4, where r₁ is the radius of one of the circles (the smaller one), and r₂ is the radius of the other circle. We know that the relationship between the radius r of a circle and the area A of a circle is given by the following formula: A =πr², where π is a universal, well-known constant.

What is the radius of a circular ground?

The radius of a circular ground is 35 m. Outside it, runs a road of width 3.5 m. Find the area of the road.