Triangle Basics
This type of triangle has three equal sides.
Equilateral triangle
If one angle is 40° and another is 60°, the third angle is ____.
80°
A triangle has this many sides.
Three
A triangle with one 90° angle is called this.
Right triangle
An angle larger than 90° in a triangle is called this.
Obtuse angle
A triangle with two equal sides is called this.
Isosceles triangle
The sum of all angles in a triangle is always this.
180°
A triangle with one obtuse angle is called this.
Obtuse triangle/ Obtuse-angled triangle
This special triangle is half of a square.
Right isosceles triangle (or just right triangle if they cut a square in half diagonally)
A triangle with no equal sides is called this.
Scalene triangle
The third angle in an isosceles triangle with two angles of 50° each is _____.
80°
Name 2 parts of a triangle
apex/vertex, base, height,
True or False: A triangle can have more than one right angle.
False (it can only have one right angle)
A triangle where all angles are equal is called this, and each angle measures __°.
Equilateral triangle, 60° each
Name the 3 things we used to draw triangles
ruler, protractor, compass