Question

If ABC is an equilateral triangle, what is the measure of 13 years ago

Answer 1

I'm sure you can do this one. What are the internal angles of an equilateral triangle?

Answer 2

All should be 60, am I right?

Answer 3

Exactly. They are all equal and add up to 180, so they each must be 60º

Answer 4

Look where <DAB is in relation to <BAC. This is the same external angle theorem as before.

Answer 5

What do I do to find out the measure of it?

Answer 6

What is the relation of <DAB and <BAC?

Answer 7

120