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Mathematics

2 answers:

guapka [62]2 years ago

8 0

Step-by-step explanation:

$a = \pi {r}^{2} \\ a = \pi {5}^{2} = 78.5 \: {in}^{2}$

sweet-ann [11.9K]2 years ago

6 0

Answer:

The area of this circle is 78.5

Step-by-step explanation:

The area of a circle can be calculated with the equation πr². r stands for "radius", the distance between the center of the circle to any point of its edge which also equals to half of a circles diameter. Since the diameter of this circle is 10 in., its radius is

$r = d/2 = 10/2 = 5\\$

Then, we use this to find the area

Area = $\pi r^2=\pi (5)^2=25\pi=78.5$ (rounded to the first decimal place)

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LuckyWell [14K]

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about the second one... well, is a "fait accompli" that using the pythagorean theorem, if x = 8 and y = 5, the hypotenuse must be √(8² + 5²) = √(89), which is neither of those choices.

5, 8, 13 are no dice, namely 5² + 8² ≠ 13

25, 64, 17 is are no dice too, because 25² + 17² ≠ 64²

however, 5,12 and 13 are indeed a pythagorean triple

also is 39, 80, 89.

when looking for a pythagorean triple, recall that c² = a² + b².

so the longest leg is the sum of the square of the small ones.

so what you'd do is, check the small legs, square them, add them up, if they're indeed a pythagorean triple, they "must" add up to the longest leg.

4 0

3 years ago

Evaluate:45/60+12/60-4/60

sdas [7]

Remember to incorporate Bimdas, into you calculation and ensure where the addition and subtraction occur you work from left to right.