Types of Angles
This angle is exactly 90 degrees.
Right Angle
Two angles added together add up to 90 degrees. One angle is 70 degrees. What is the measure of the 2nd angle?
20 degrees
A triangle that has a 90 degree angle.
Right Triangle
A shape with 4 straight sides.
Quadrilateral
How many sides does an octagon have?
8
This angle is less than 90 degrees.
Acute Angle
Two angles added together add up to 90 degrees. One angle is 55 degrees. What is the measure of the 2nd angle?
35 degrees
A triangle that has 3 equal side lengths.
Equilateral Triangle
A shape with 4 straight sides, all 90 degree angles, all side lengths equal.
Square
How many sides does a pentagon have?
5
This angle is more than 90 degrees.
Obtuse Angle
Two angles added together add up to 180 degrees. One angle is 36 degrees. What is the measure of the 2nd angle?
144 degrees
If the side lengths of a triangle are: 3 in, 2 in, and 5 in. What type of triangle is it?
Scalene Triangle
A shape with 4 straight sides, all 90 degree angles, and all side lengths are not the same.
Rectangle
How many lines of symmetry does a square have?
4
This angle is greater than 180 degrees.
Reflex Angle
Two angles added together add up to 270 degrees. One angle is a right angle. What is the measure of the 2nd angle?
180 degrees
A triangle has angles measures of: 15 degrees, 85 degrees, and 80 degrees. What type of triangle is it?
Acute Triangle
A shape with 4 straight sides and opposite sides parallel. There may be no 90 degree angles.
Parallelogram
How many lines of symmetry does a circle have?
Infinite
This is the name of 2 angles that add up to 90 degrees.
Complementary Angles
Two angles combined make a complete turn (circle). One angle measures 200 degrees. What is the measure of the other angle?
160 degrees
A triangle with 2 equal sides and 1 angle greater than 90 degrees.
An obtuse isosceles triangle.
A shape with 4 straight sides and only one pair of parallel lines.
Trapezoid
How many degrees is a quarter-turn?
90 degrees