Answer:
Explanation:
Punch card is the oldest computer storage; followed by tape and then floppy disk. Hard drive goes back as far as floppy but is still in use today. CD/DVD/BR discs are all later storage but are also used for storing music and videos. USB flash, SD card, SSD and cloud storage are the common technologies used today for data storage.
Explanation:
In this question
d is known as diameter
r is known as radius
c is known as circumference
pi is known as π
a is known as area
Now, In Maths
Area of circle = π×r×r
Circumference of circle = 2×π×r
Radius (r) = diameter(d)÷2
Given diameter is 6
then, r = 6 ÷2
r = 3
so, diameter = 6
radius = 3
circumference = 2×π×r
= 2×3.14×3 ( the value of π is equal to 3.14)
= 18.84
Area = π×r×r
= 3.14×3×3 ( the value of π is equal to 3.14)
= 28.26
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