In this publication, we will consider what a right angle is, list the main geometric shapes in which it occurs, and also analyze an example of a problem on this topic.
Definition of a right angle
Angle is directif its equals 90 degrees.
In the drawings, not a round arc is used to indicate such an angle, but a square one.
A right angle is half a straight angle (180°) and in radians is equal to Π / 2.
Shapes with right angles
1. Square – a rhombus, all angles of which are equal to 90 °.
2. Rectangle – a parallelogram, all corners of which are also right.
3. A right triangle is one of its right angles.
4. Rectangular trapezoid – at least one of the angles is 90 °.
Example of a problem
It is known that in a triangle one of the angles is right, and the other two are equal to each other. Let’s find unknown values.
Solution
As we know from , it equals 180°.
Therefore, two unknown angles account for 90°