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Lunna [17]
3 years ago
9

-

Mathematics
1 answer:
Airida [17]3 years ago
7 0

Answer:

Step-by-step explanation:

C(-5,9), and D(5, 4)

Slope  = y₂ - y₁/ x₂-x₁

    m1 = 4 - 9 / 5- [-5]

         = -5 / 5+5  = -5/10 = -1/2

    m1 = -1/2

A(x, 1), B(-3,7)

Slope of AB m2 =  7- 1 / -3 - x  = 6/ -3-x

As AB  || CD, m2 = m1

                  6/-3-x = -1/2

                  6*2      = -1 * (-3-x)        {cross multiplication}

                          12 = (-1 * -3) - x * -1

                 3 + x = 12

                       x = 12 - 3

                       x = 9

                 

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The measure of angle ∠ACB is 70°. Then the correct option is C.

<h3>What is the triangle?</h3>

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The complete question is given below.

Use the diagram showing m || n, as well as the relationships between interior and exterior angles of ΔABC, to answer the questions.

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