Question

In isosceles Triangle RST below what is the value of y​

Answer 1

second option

Explanation:

y + y + 38 = 180 degree ( sum of interior angle of a triangle is 180 degree)

2y = 180 - 38

y = 142/2

y = 71 degree

Answer 2

71 degrees

Explanation:

Hi there!

All the interior angles of a triangle add up to 180 degrees.

Knowing this, we can construct the following equation:

`180=y+y+38\\180=2y+38`

Subtract 38 from both sides

`180-38=2y+38-38\\142=2y\\71=y`

I hope this helps!