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KiRa [710]
3 years ago
8

The vertex angle of an isosceles triangle is 20° less than the sum of the base angles. Which system of equations can be used to

find the measure of the vertex and base angles?
A)
v + 2b = 180; 2b - 20 = v


B)
v + 2b = 180; 2b + 20 = v


C)
v - 2b = 180; v + 2b = -20


D)
v - 2b = 180; -2b - 20 = v
Mathematics
1 answer:
WINSTONCH [101]3 years ago
6 0

The answer to the above question can be explained as under -

We know that, the sum of angles of triangle is 180°.

So, vertex angle plus base angles are equal are equal to 180°.

Let the vertex angle be represented by "v" and base angles be represented by "b".

Thus,  v + b + b = 180°

So,  v + 2b = 180°

Next, the question says, the vertex angle is 20° less than the sum of base angles.

Thus, 2b - 20° = v

<u>Thus, we can conclude that the correct option is A) v + 2b = 180°, 2b - 20° = v</u>

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The factors illustrate they the sides of the rectangles are:

  • (x - 1)(x - 2)
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<h3>How to get the factors?</h3>

The first equation given is x² - 3x + 2.

= x² - 3x + 2.

= x² - x - 2x + 2

= x(x - 1) - 2(x - 1)

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In the rectangular figure, the length and width should be the expressions above.

The second equation given is 2x² + x - 6.

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In the rectangular figure, the length and width should be the expressions above.

Learn more about factor on:

brainly.com/question/219464

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