Select all equations that are true. A. 2 2 3 × 4 = 8 2 3 2 2 3 × 4 = 8 2 3 B. 3 1 3 × 5 8 = 2 1 12 3 1 3 × 5 8 = 2 1 12 C. 6 2 3 × 2 1 2 = 16 2 3 6 2 3 × 2 1 2 = 16 2 3 D. 1 5 12 × 6 2 3 = 9 4 9 1 5 12 × 6 2 3 = 9 4 9

7

step-by-step explanation:

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.

b and c

step-by-step explanation:

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.