Final answer:
A triangle with two 45° angles is an isosceles triangle with two equal sides. It is also an acute triangle.
Step-by-step explanation:
A triangle with two 45° angles is called an isosceles triangle because it has two equal angles. In an isosceles triangle, the two sides opposite the equal angles are also equal, making it have two equal sides. The remaining angle in the triangle will always be less than 90°, making it an acute triangle.