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2 years ago

Question 1 (1 point)

Mathematics

2 answers:

svlad2 [7]2 years ago

8 0

Answer:

9π units²

Step-by-step explanation:

To obtain an exact answer, use π, not an approximation such as 3.14.

A = πr² is the appropriate formula.

Here,

A = (3)^2·π units², or 9π units²

BigorU [14]2 years ago

8 0

A=πr2=π·32≈28.27433
If you do pie times 3 squared you get 28.27433

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Answer:

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Step-by-step explanation:

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So, triangles ΔCBD and ΔCAD are right angled triangles.

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From ΔCBD,

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Now, from ΔCAD,

$m\angle CAD$ is same as $m\angle A$

So, $m\angle CAD=\alpha$

$m\angle CAD+m\angle ACD =90\\\alpha+m\angle ACD=90\\m\angle ACD=90-\alpha$

Hence, the unknown angles of both the triangles are:

$m\angle CDB=90\\m\angle CBD=90-\alpha\\m\angle BCD=\alpha\\\\m\angle CDA=90\\m\angle CAD=\alpha\\m\angle ACD=90-\alpha$

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Step-by-step explanation:

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