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2 years ago

Please help me , at least do one and explain it please .

Mathematics

1 answer:

Len [333]2 years ago

7 0

9514 1404 393

Answer:

113.0 cm²
2464.0 in²
95.0 ft²

Step-by-step explanation:

1. The area of a circle is given by the formula ...

A = πr² . . . . . where r is the radius

The radius is shown as 6 cm, so the area is ...

A = (3.14)(6 cm)² = 113.0 cm²

2. The radius is shown as 28 in. We note that this is a number divisible by 7, so we choose 22/7 for π.

A = (22/7)(28 in)² = 2464 in² . . . . see comment

3. The radius is half the diameter, so is 11/2 = 5.5 ft. Then the area is ...

A = (3.14)(5.5 ft)² = 95.0 ft²

_____

<em>Additional comment</em>

If you use a more exact value of π for problem 2, the area is 2463.0 in². If you use 3.14 as the value of π, the area rounds to 2461.8 in². For these values of pi (3.14 or 22/7), the answer is only good to about 3 significant digits. 2464 has more significant digits, so digits beyond the first 3 may be in error.

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