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4 years ago

How do you find the surface area of a circle?

Mathematics

1 answer:

Blizzard [7]4 years ago

4 0

Answer:

πr²

Step-by-step explanation:

The surface area of a circle is πr²

Pie is 22/7 or 3.14

While the radius of a circle is any line from the centre of a circle to any part of the circumference of the circle. A diameter is any line that cuts the circle into two equal halves, cutting the circle from the centre.

To get the surface area of a circle, you draw a line from the centre of the circle, and then touch any part of the circumference of the circle. Then you measure the line, that's the radius.

If for instance, the radius gives 7cm, you find the Square, And then multiply it with pie.

22/7 X 7 ²

22/7 X 7 X 7

22 X 7

154cm²

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Yuki888 [10]

Answer:

Step-by-step explanation:

f(6) = -3 * 6 + 10 = -18 + 10 = -8

g(f(6)) = g(-8)

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6 0

4 years ago

How I do this someone ples help I need help with 25 and 27.

marta [7]

Number 15 is no solution.

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This could be explained as -2≤x≤2

8 0

4 years ago

Solve for x : 2x^2+4x-16=0

alekssr [168]

$2x^2+4x-16=0\ \ \ /:2\\\\x^2+2x-8=0\\\\\underbrace{x^2+2x\cdot1+1^2}_{(*)}-1^2-8=0\\\\(x+1)^2-1-8=0\\\\(x+1)^2-9=0\\\\(x+1)^2=9\iff x+1=-3\ or\ x+1=3\\\\x=-3-1\ or\ x=3-1\\\\x=-4\ or\ x=2\\\\\\(*)\ (a+b)^2=a^2+2ab+b^2$

$2x^2+4x-16=0\ \ \ /:2\\\\x^2+2x-8=0\\\\a=1;\ b=2;\ c=-8\\\\\Delta=b^2-4ac\ if\ \Delta > 0\ then\ x_1=\frac{-b-\sqrt\Delta}{2a}\ and\ x_2=\frac{-b+\sqrt\Delta}{2a}\\\\\Delta=2^2-4\cdot1\cdot(-8)=4+32=36;\ \sqrt\Delta=\sqrt{36}=6\\\\x_1=\frac{-2-6}{2\cdot1}=\frac{-8}{2}=-4;\ x_2=\frac{-2+6}{2\cdot1}=\frac{4}{2}=2$

3 0

3 years ago

Read 2 more answers

Ayo could anyone please help with this

mestny [16]

The answer should be answer choice B have a good day! brainleist;) ?

7 0

3 years ago

Please help will mark brainliest

nataly862011 [7]

I think it’s A. If not, then B.

5 0

4 years ago