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ella [17]
3 years ago
9

Which of these figures has rotational symmetry?

Mathematics
1 answer:
Bumek [7]3 years ago
8 0

Hello!

The answer is a.

Good luck! :)

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Does anyone know where I can find answer keys for CPM Core Connections Course 3 (the eighth grade one) answers? Specifically for
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Please help I don’t understand.
Lina20 [59]
You can work out c first. That's probably the key to the whole problem.
The adjacent side to a 60o angle is 1/2 the hypotenuse
The hypotenuse in this case = 4 Sqrt(3)
Then c = 1/2 (4 sqrt(3)) 
c = 2 sqrt(3) That means d is not true.

Next work out a.
a is in the same triangle as c and the hypotenuse.
a^2 + c^2 = hypotenuse^2
a = ??
c = 2 sqrt(3)
h = 4 sqrt(3)
a^2 + (2 sqrt(3))^2 = (4 sqrt(3))^2
(sqrt(3))^2 = 3
a^2 + 4 * 3 = 16 * 3
a^2 + 12 = 48
a^2 = 48 - 12
a^2 = 36
a = 6

Now we need to work out d
The side opposite and the side adjacent  are equal when opposite a 45o angle in a right angle triangle
d = 6


The last thing to work out is be
a = 6
d = 6
c = ???

a^2 + d^2 = c^2
6^2 + 6^2 = c^2
c^2 = 72
c = sqrt(72)
c = sqrt(6*6*2)
c = 6 sqrt(2)

The answer should be B??? Check this out.
4 0
3 years ago
Which of the next equations are linear:
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The first and third ones are both linear. The second one is not because of the exponent. Instead it is a parabola. 
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4 years ago
Did I do this right?
Dimas [21]
Yeah that’s correct
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