Q. What is the radius of a circle if the area is 25 pi?
The required circumference is 10pi or 31.42 units. Given the area of the circle is 25pi. We will divide by pi. Then, the radius of the circle is r= 5.
Q. How fast is the area of a circle increasing?
The area of a circle increases at a rate of 6 cm^2/s | Wyzant Ask An Expert. Riri M.
Q. What happens if you triple the radius of a circle?
If the radius is r, then the circumference is 2πr. If the radius r is tripled it becomes 3r. The circumference will then be 2π(3r) = 3(2πr). If the radius of a Circle is tripled, then its diameter is also tripled, and subsequently, its circumference is also tripled.
Q. What happens to the area of a circle if its radius is increased by 40%?
If diameter increases by 40%, radius will also be increased by the same percentage. If radius is 1 unit and increased by 40%, it will become 1.4 units and on squaring it becomes 1.96 (Area of a circle = pi*r*r). Thus, the area increases by 96%.
Q. What will be the percentage increase in the area of circle whose circumference is increased by 50%?
125%
Q. What is the area of the largest circle that can be drawn inside?
The area of the circle = πr2=722×7×7=154cm2.
Q. Is the circumference of a circle increases from 45 to 85 then find the percentage increase in the area of the circle?
If the circumference of the circle increases from 4π to 8π then the percentage increase in the area of a circle is 300%.
Q. Is the circumference of a circle and the perimeter of a square are equal then?
Therefore, the ratio of the area of the circle and square as 4:1. Note: The circumference is same as the perimeter but for circular objects whereas both the perimeter and circumference is same as both of them are the measurement of the outer length of the object.
Q. What is the diameter of a circle whose area is equal to the sum?
Answer. Answer: Diameter is 82 cm. The area of a circle is equal to the sum of the areas of two circles of radii 40 cm and 9cm.
Q. Which of the following is a circumference of a circle?
When a circle’s diameter is 1, its circumference is π. When a circle’s radius is 1—called a unit circle—its circumference is 2π.
Q. What is the ratio of the areas of a circle and an equilateral triangle?
Hence, the Ratio of the Areas of circle and equilateral ∆ is π : √3 .
