3.4

Question 1

exterior angle of a polygon

Answer 1

is an angle at a vertex of the polygon, outside the polygon, formed by one side and the extension of an adjacent side

Question 2

scalene triangle

Answer 2

is a triangle in which all three sides have different lengths.

Question 3

obtuse triangle

Answer 3

is a triangle with one obtuse angle (greater than 90°) and two acute angles.

Question 4

isosceles triangle

Answer 4

is a triangle with (at least) two equal sides. In the figure above, the two equal sides have length and the remaining side has length .

Question 5

equiangular triangle

Answer 5

is a triangle where all three interior angles are equal in measure. Because the interior angles of any triangle always add up to 180°, each angle is always a third of that, or 60°

Question 6

right triangle

Answer 6

is a triangle in which one angle is a right angle (that is, a 90-degree angle).

Question 7

Equilateral triangle

Answer 7

In geometry, an equilateral triangle is a triangle in which all three sides are equal.

Question 8

acute angle

Answer 8

is an angle smaller than a right angle.

Question 9

remote interior angles

Answer 9

are angles that don’t share a vertex or corner of a triangle with the exterior angle.