It is true. The triangles are congruent.
See the attached files
<h2>Explanation:</h2>
Here we have the following inequality:

In order to graph the shaded region, we have to graph the equation of the line
whose slope is
and y-intercept
. So the graph of the line is shown in the First Figure below.
To find the shaded region we need to have a look at the symbol > that indicates that the shaded region is above the graph of the line and. Since this doesn't include the symbol =, then the line is dotted. Therefore, the resulting region is shown in the second Figure.
<h2>Learn more:</h2>
Shaded regions: brainly.com/question/9611462
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The answer is 270 , I multiplied 15 by 18 and got 270
Answer:

Step-by-step explanation:
Given

Required
Determine the period
A sine function is represented as:

Where

By comparing:
and 

So:

So, we have:



Hence, the period of the function is 