3 years ago

In the accompanying diagram of AABC, side AB is

Mathematics

1 answer:

guapka [62]3 years ago

3 0

Answer:

x = 10

Step-by-step explanation:

The external angle of a triangle is equal to the sum of the 2 opposite interior angles.

∠CBD is an external angle of the triangle, thus

4x + 30 = 2x + 10 + x + 30, that is

4x + 30 = 3x + 40 ( subtract 3x from both sides )

x + 30 = 40 ( subtract 30 from both sides )

x = 10

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