Question

FAN AND MEDAL
The vertex angle of an isosceles triangle measures 40°. What is the measure of a base angle?

Answer 1

40°
70°
100°
140°

Answer 2

it's 100

Answer 3

Will you explain?

Answer 4

Yes. Haha.

Answer 5

So, we know that in an isosceles triangle, \(\text{two}\) the angles/sides are equal and the \(\text{base}\) is the largest one.

Answer 6

That being said...

Answer 7

We know that there are 180 degrees in a triangle, so you should come up with an equation like this: \(40+40+x=180\).

Now solve for x. x is the base. :)

Answer 8

Thanks so much! I understand now.

Answer 9

No problem! :)