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Fantom [35]
3 years ago
5

Plz hurry 19 points will mark brainliest

Mathematics
2 answers:
inysia [295]3 years ago
5 0
The answer is 100. Explanation: Supplementary is two angles that add up to 180 therefore the answer is 100
Georgia [21]3 years ago
3 0

Good evening,

Answer:

<h2>100°</h2>

Step-by-step explanation:

Two angles are supplementary if the sum of their measures is equal to 180°

then the measurement of an angle that is supplementary to an angle that measures 80° is :

180 - 80 = 100°

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Nastasia [14]

The area formula of a circle is r^{2} × π.

With that being said, we can solve both problems!

Starting with part A:

-The radius we know is 21cm. From there, we can substitute in our formula with the new value.

21^{2} x π

From there, we can square our radius:

(21 x 21) x π

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And finally, we can multiply by pi to get our answer.

(441) x π

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Which rounded to the nearest tenth is 1385.4. Therefore, the area of the porthole is 1385.4 centimetres.

The second part can be followed with the same process, hopefully you understand the concept enough to where you're comfortable solving problems like this on your own. Feel free to reach out if you have any further trouble!

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