Question

Can someone tell me how to do that and the answer

Answer 1

43

Explanation:

because all triangle are equal to 180 degrees

so if you add 82 and 55

`82+55 = 137`

then subtract to find the missing value

so,

`180 - 137 = 43`

Answer 2

43°

Explanation:

The sum of all internal/interior angles of a triangle is always equal to 180°

Because of this, if the missing angle is x we can write the equation:

82°+55°+x=180° since the interior angles are given

Add like terms:

⇒ 137°+x=180°

Subtract 137:

⇒ x=43°