Question

If 2 of the angles of a a triangle are 30 and 70 degrees, then the third angles measures is

Answer 1

`{\boxed{\sf{Measure \ of \ third \ angle = 80 \degree}}}`

Explanation:

Let the third angle be 'x'

We know that,

Sum of all the angles of a triangle = 180°

`\sf 30 + 70 + x = 180`

`\sf 100 + x = 180`

Subtracting 100 from both sides,

`\sf x = 180 - 100`

`\bf x = 80`

`\therefore` Third angle = 80°