Look at triangle abc. what is the length of side ab of the triangle? 1. 2 2. square root of 20 3. 6 4. square root of 38

The distance between two points and can be calculated by the formula

The vertices A and B of the triangle ABC have coordinates (4,5) and (2,1), respectively.

Therefore,

correct choice is 2

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.

b. 2 and 4

step-by-step explanation: