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Anuta_ua [19.1K]
3 years ago
9

I need help understanding this problem.​

Mathematics
1 answer:
kobusy [5.1K]3 years ago
4 0

Answer:

59

Step-by-step explanation:

The sum of the opposite interior angles of a triangle is equal to the exterior angle

4x+11  +51  = 10x -10

Combine like terms

4x+62 = 10x -10

Subtract 4x from each side

4x+62-4x = 10x-10-4x

62 = 6x-10

Add 10 to each side

62+10 = 6x-10+10

72 = 6x

Divide by 6

72/6 = 6x/6

12 =x

We want to find angle D

<D =4x+11

     = 4*12 +11

    = 48+11

    = 59

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