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Mathematics 20 Online
OpenStudy (anonymous):

What is the value of x?

OpenStudy (anonymous):

OpenStudy (anonymous):

80 degrees

OpenStudy (anonymous):

can you help me with 4 more?

OpenStudy (gorv):

sum of angle of triangle=180 30+70+x=180 x=180-100

OpenStudy (anonymous):

How about if i helped you to do it your self? a+b+c = 180 a, b and c are angles.

OpenStudy (anonymous):

OpenStudy (anonymous):

is it 45?

OpenStudy (mathstudent55):

No. 120 + 25 + x = 180 Solve for x.

OpenStudy (anonymous):

35?

OpenStudy (mathstudent55):

Got it!

OpenStudy (anonymous):

How would I do this one?

OpenStudy (anonymous):

?

OpenStudy (mathstudent55):

Here you need some information form geometry about triangles. Notice the two small marks on sides JK and JL. Those marks mean the sides are congruent (they have the same length). In a triangle, if two sides are congruent, then their opposite angles are congruent. That means angles K and L are congruent. That means that when you write the equation for the angle measures, a + b + c = 180, you write x + x + 10 = 180 Now solve for x.

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