I don't remember how to do this. plz help

TRUE

Step-by-step explanation:

In a triangle having sides a, b and c units,

For a right triangle following condition should be fulfilled,

(Largest side)² = (Leg 1)² + (Leg 2)² [Pythagoras theorem]

If the sides of a triangle are 4, 12 and

= 4² + 12²

160 = 16 + 144

160 = 160

True.

Therefore, the given statement is TRUE.

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.

i cant answer this, theres no table. sorry man

step-by-step explanation: