How to finder this angle?​

two other angles of a triangle are 75 degree .Both two angles will be 70 degree since it is an isosceles triangle.

Step-by-step explanation:

according to the given diagram the given triangle is an isoscels triangle because it's to sides are equal

here unknown name is also c degree because the base angles of an isosceles triangle are equal.

so to find angle c

equation is :

c + c + 30 = 180 degree (sum of interior angles of a triangle)

2c + 30 = 180

2c = 180 - 30

2c = 150

c = 75 degree

answer: its the third option.

step-by-step explanation:

i just took the test.

my dear correct answer is option number 3