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seraphim [82]
3 years ago
15

PLS HELP ON MATH QUIZ PT.2

Mathematics
1 answer:
vredina [299]3 years ago
4 0

Given:

In the given figure, m\angle 1=(3x+12)^\circ, m\angle 2=(3x+18)^\circ, m\angle 3=(7x+10)^\circ.

To find:

The measure of angle 3.

Solution:

According to the exterior angle theorem of a triangle, the measure of exterior angle is equal to the sum of two opposite interior angles of a triangle.

Using exterior angle theorem of a triangle, we get

m\angle 3=m\angle 1+m\angle 2

7x+10=(3x+12)+(3x+18)

7x+10=6x+30

7x-6x=30-10

x=20

The value of x is 20. So, the measure of angle 3 is:

m\angle 3=(7x+10)^\circ

m\angle 3=(7(20)+10)^\circ

m\angle 3=(140+10)^\circ

m\angle 3=150^\circ

Therefore, the measure of angle 3 is 150 degrees.

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