Answer:
A triangle where the angles in the inside are 100 degrees, 40 degrees, and 40 degrees.
Explanation:
The angles inside a triangle always add up to 180 degrees
And an obtuse triangle is a triangle whose biggest angle is bigger than 90 degrees
100 is biggest angle out of the three angles we're using to make the triangle and 100 is bigger than 90.
Adding the three angles we're using also makes 180 (100 + 40 + 40)