HELP PLSQ

Step-by-step explanation:

Step 1:

The total of the angles in any triangle is 180°.

So to determine the third angle of the given triangles, we subtract the sum of the other two sides from, 180°.

The third angle = 180° - (the first angle + the second angle).

Step 2:

For triangle ABC,

,

So

For triangle DEF,

,

So

Step 3:

For triangle GHI,

,

So

For triangle JKL,

,

So

89

step-by-step explanation:

5/12, or 5: 12

step-by-step explanation: