True or false?
One of the angles in a rectangle may be an acute angle.
True or false?
One of the angles in a rectangle may be an acute angle.
Look at the parallelogram ABCD below.
What can be said about triangles ACD and ABD?
Look at the quadrilateral below.
Determine if the quadrilateral is a rectangle.
Given the rectangle, calculate the marked angle
Look at the polygon in the diagram.
What type of shape is it?
True or false?
One of the angles in a rectangle may be an acute angle.
One of the properties of a rectangle is that all its angles are right angles.
Therefore, it is not possible for an angle to be acute, that is, less than 90 degrees.
False
Look at the parallelogram ABCD below.
What can be said about triangles ACD and ABD?
According to the side-angle-side theorem, the triangles are similar and coincide with each other:
AC = BD (Any pair of opposite sides of a parallelogram are equal)
Angle C is equal to angle B.
AB = CD (Any pair of opposite sides of the parallelogram are equal)
Therefore, all of the answers are correct.
All answers are correct.
Look at the quadrilateral below.
Determine if the quadrilateral is a rectangle.
From the given information, we know that triangle EBC is equilateral.
In an equilateral triangle, all angles are equal to each other.
Therefore, angle B is equal to 60 degrees.
Since none of the angles are 90 degrees, we can safely say that the quadrilateral is not a rectangle.
It is not a rectangle.
Given the rectangle, calculate the marked angle
120
Look at the polygon in the diagram.
What type of shape is it?
Trapezoid
\( \)
According to the diagram, is the shape a rectangle?
The quadrilateral ABCD is a square.
Is the square a rectangle?
The quadrilateral ABCD above is a rectangle.
The line EF is drawn parallel and equal to BD.
How many rectangles are there in the drawing?
Given:
AC=3
BD=3
AB||CD
According to the data, is it possible to say that the quadrilateral is a rectangle?
Which sentence is true?
According to the diagram, is the shape a rectangle?
Yes
The quadrilateral ABCD is a square.
Is the square a rectangle?
Yes.
The quadrilateral ABCD above is a rectangle.
The line EF is drawn parallel and equal to BD.
How many rectangles are there in the drawing?
3
Given:
AC=3
BD=3
AB||CD
According to the data, is it possible to say that the quadrilateral is a rectangle?
Not true
Which sentence is true?
The diagonals in the rectangle form two pairs of congruent and isosceles triangles.