. Tập nghiệm của bất phương trình  

 
1 5
1 1
x x
x x
là:

pnj hnu n

126

11

yes

.

..

x u g

M∠1 = 65° (given)

m∠1 + m∠2 = 180 (straight angle)
65 + m∠2 = 180
Simplify, subtract 65 from both sides
m∠2 + 65 (-65) = 180 (-65)
m∠2 = 115°

Because of vertical angle theorem, m∠3 is the same length as m∠2. 
m∠3 = 115°

Using alternative interior angle theorem, m∠3 ≅ m∠6
m∠6 = 115°

m∠7 is a vertical angle of m∠6. They are of the same measurement

m∠6 ≅ m∠7 ∴ m∠7 = 115°

115°, or C, is your answer

hope this helps