Question

1) d= 7.4 mm

Calculate the area of the circle.

2) r=2.2 yd.
Calculate the circumference of the circle.

3) d = 5 cm
Calculate the circumference of the circle.

4) d = 6 m
Calculate the circumference of the circle.

5) r = 2.1 m
Calculate the area of the circle.

6) r=1.3 mm
Calculate the circumference of the circle.

Answer 1

1. 43.01 mm²

2. 13.82yd

3. 15.71cm

4.18.85m

5. 13.85m²

6. 8.17mm²

Explanation:

/ means divided by

* means multiplied by

radius is half of a diameter

circumference of a circle is pi multiplied by diameter

area of a circle is pi multiplied by radius squared

1. radius is 7.4 divided by 2 which is 3.7

radius of 3.7 squared is 13.69

pi multiplied by 13.69 is 43.01

2. diameter is radius times 2

2.2 times 2 is 4.4

ℼ * 4.4 = 13.82

3. pi*5=15.71

4. pi*6=18.85

5. 2.1*2.1 = 4.41 -> pi*4.41 = 13.85

6. 1.3*2= 2.6 -> pi*2.6=8.17