Exam 20: Lines, Angles, and Triangles

An obtuse angle is less than a right angle.

If the base angles of an isosceles triangle each measure 52°, what is the measure of the vertex angle?

Two angles of a triangle are 72° and 22°. What is the measure of the third angle?

Given the following dimensions for the sides of a triangle, tell whether it is a triangle and if so what type of triangle is it: 4 inches, 7 inches, and 9 inches.

Two or more straight lines in a plane may or may not intersect .

Two angles in a triangle each equal 47°, which of the following would define what type of triangle this is?

If the sides of a triangle are 14 inches, 10 inches, and 13 inches, what is the perimeter of the triangle?

How many degrees are there in an isosceles triangle?

If the angles of a triangle are 60°, 60°, and 60°, what type of triangle is this?

What is the name of a triangle with one obtuse angle and two acute angles?