A circle has a circumfrence of 14mm. Find its area. Give an exact answer
2 answers:
Answer:
15.597 mm^2
Step-by-step explanation:
The formula for circumference of a circle 2πr, in which r is the circle's radius.
The formula for area of a circle π. This means that we can find the radius from the circle's circumference and use it to find the area.
First we have to equal 14 to 2πr because both are representations of circumference and we need to find r.
14 = 2πr
Solve:
14/2 = 2πr/2
7 = πr
7/π = πr/π
2.23 = r
Plug 2.23 into the formula for area as r and solve:
π(2.23)^2
π4.96
15.597
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I added the diagram of the question.
<u><em>Answer:</em></u>
h = 60°
<u><em>Explanation:</em></u>
We are given that lines k and l are parallel lines.
This means that angles 120° and h are <u>supplementary angles</u>.
This means that their measures <u>add up to 180°</u>
<u>Therefore:</u>
180° = 120° + h
h = 180° - 120°
h = 60°
Hope this helps :)
<u><em>Answer:</em></u>
h = 60°
<u><em>Explanation:</em></u>
We are given that lines k and l are parallel lines.
This means that angles 120° and h are <u>supplementary angles</u>.
This means that their measures <u>add up to 180°</u>
<u>Therefore:</u>
180° = 120° + h
h = 180° - 120°
h = 60°
Hope this helps :)