Download right angle

12/21/2016
(67) Right angles in shapes (informal definition) | Quadrilateral types | Quadrilaterals | Geometry | Khan Academy
Right angles in shapes (informal definition)
Identify right angles in shapes.
Share to Google Classroom
Share
Tweet
Email
Introduction
Many shapes have corners. We call a corner a right angle if we can fit a little
square perfectly inside it.
Consider the trapezoid
Let's draw a square in each corner.
In which corners did the little square fit perfectly?
Right angle
Not a
right angle
Right angle
Not a
right angle
https://www.khanacademy.org/math/geometry-home/quadrilaterals-and-polygons/geometry-quads/a/right-angles-in-shapes
1/3
12/21/2016
(67) Right angles in shapes (informal definition) | Quadrilateral types | Quadrilaterals | Geometry | Khan Academy
The trapezoid has two right angles.
Practice
First, let's study some more examples.
Now, try it yourself.
How many right angles are in this square?
Check
How many right angles are in this pentagon?
https://www.khanacademy.org/math/geometry-home/quadrilaterals-and-polygons/geometry-quads/a/right-angles-in-shapes
2/3
12/21/2016
(67) Right angles in shapes (informal definition) | Quadrilateral types | Quadrilaterals | Geometry | Khan Academy
Check
[Show solutions.]
Challenge problem
How many right angles does this shape have?
Check
[Help, I'm stuck.]
https://www.khanacademy.org/math/geometry-home/quadrilaterals-and-polygons/geometry-quads/a/right-angles-in-shapes
3/3