Question

A side of the triangle below has been extended to form an exterior angle of 79°. Find the value of x. ??????

- 100 point question

Answer 1

Apply supplementary angle theorem

• They have sum 180°

`\\ \rm\rightarrowtail x+79=180`

`\\ \rm\rightarrowtail x=180-79`

`\\ \rm\rightarrowtail x=101`

Answer 2

x = 101 °

Explanation:

Here give ∠ ACD exterior angles 79 °

[Angle Addition Postulate and definition of straight angle: ]

∠ACD + ∠ACB = 180

79 + n = 180

n =180-79=101

n = 101

[RevyBreeze]