Question

Calculate the area of the circle having the following radius (r) or diameter (d).

a) Diameter (d) = 5 cm
b) Radius (r) = 3 cm
c) Diameter (d) = 12 cm
d) Radius (r) = 8 ft.
e) Diameter (d) = 18 cm
f) Diameter (d) = 20 km
g) Diameter (d) = 15 mm
h) Diameter (d) = 22 cm
i) Radius (r) = 16 yd
Find the area of a circular room whose diameter is 14 cm. (π=3.14)
Find the area of a circle having the following circumference. (Use π = 3.14)
a) 34.54 cm
b) 65.94 cm
c) 1884 inch
d) 113.04 cm
e) 376.60 ft
Find the area occupied by the base of a cylindrical bowl if the diameter of its base is 9 cm. (Use 3.14)

Answer 1

To calculate the area of a circle, use A = πr². For a given diameter (d), divide it by 2 to find the radius (r). For a given circumference (C), divide it by 2π to find the radius. To find the area of the base of a cylindrical bowl, use A = πr².

Step-by-step explanation:

To calculate the area of a circle, you can use the formula A = πr², where π is approximately 3.14 and r is the radius of the circle. If the diameter (d) is given, you can divide it by 2 to find the radius. For example, for a diameter of 5 cm, the radius would be 5/2 = 2.5 cm. Plug the value of the radius into the formula to calculate the area. Repeat this process for all the given radii or diameters in the question.

For the area of a circular room with a diameter of 14 cm, plug the radius (7 cm) into the formula A = πr².

To find the area of a circle given the circumference, you can use the formula A = (C² / 4π), where C is the circumference. Divide the circumference by 2π to find the radius and then calculate the area using the formula. Repeat this process for all the given circumferences.

Finally, to find the area of the base of a cylindrical bowl with a given diameter, you can use the formula A = πr², where r is the radius. Divide the diameter by 2 to find the radius and then calculate the area using the formula.