Question

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

Answer 1

Answer:

second option

Step-by-step 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

Answer:

71 degrees

Step-by-step 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!