3. Given: 21 22 Prove: a b
What is the missing reason in the proof?
a
4
b
2
Statements Reasons
1. Z1 e 22 1. Given
2. 21:24 2. Vertical angles are congruent.
3. 22 a 24 3.?
4. If two lines and a transversal form
4. a b congruent corresponding angles,
then the lines are narallol

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

the best estimate is 3 because   8 can only go into 24 3 times

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