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Question 8

A supplementary angle is 2 angles forming a 180° angle.

=> We can see that ∠3 and ∠4 are forming a 180° angle.

Hence, Option D is correct.

Question 9

Hence, Option D is correct.

Question 10

∠4 is congruent to ∠5 because of vertically opposite angles.

Hence, Option C is correct.

Question 11

If ∠1 is 55°, then ∠3 will also be 55° because of vertically opposite angles.

Hence, 55° is your answer.

Question 12

We know that ∠4 = ∠2 because of vertically opposite angles.

Hence, the value of x is 13.

Hoped this helped.

answer: (3,11) is your answer.

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative