**An obtuse angle is an angle that measures more than****$90°$**** degrees, but less than** **$180°$**** degrees.**

Acute angles can appear in triangles, parallelograms, and other geometric shapes.

**Obtuse Angle **

**An obtuse angle is an angle that measures more than****$90°$**** degrees, but less than** **$180°$**** degrees.**

Acute angles can appear in triangles, parallelograms, and other geometric shapes.

**Obtuse Angle **

True or false?

The sum of two acute angles can be greater than 180 degrees?

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

True or false?

The sum of two acute angles can be greater than 180 degrees?

False.

Does the drawing show an adjacent angle?

Not true

Does the drawing show an adjacent angle?

Not true

Does the drawing show an adjacent angle?

Not true

Test your knowledge

Question 1

True or false?

An acute angle is smaller than a right angle.

Question 2

Does the drawing show an adjacent angle?

Question 3

Does the drawing show an adjacent angle?

Related Subjects

- Area
- Trapezoids
- Area of a trapezoid
- Perimeter of a trapezoid
- Parallelogram
- The area of a parallelogram: what is it and how is it calculated?
- Perimeter of a Parallelogram
- Kite
- Area of a Deltoid (Kite)
- Parallel lines
- Angles In Parallel Lines
- Alternate angles
- Corresponding angles
- Collateral angles
- Vertically Opposite Angles
- Adjacent angles
- Rectangle
- Calculating the Area of a Rectangle
- The perimeter of the rectangle
- Congruent Rectangles
- The Sum of the Interior Angles of a Triangle
- The sides or edges of a triangle
- Triangle Height
- Sides, Vertices, and Angles
- Angle Notation
- Angle Bisector
- Types of Angles
- Sum and Difference of Angles
- Sum of Angles in a Polygon
- Perpendicular Lines
- Exterior angles of a triangle
- Perimeter
- Triangle
- Types of Triangles
- Obtuse Triangle
- Equilateral triangle
- Identification of an Isosceles Triangle
- Scalene triangle
- Acute triangle
- Isosceles triangle
- The Area of a Triangle
- Area of a right triangle
- Area of Isosceles Triangles
- Area of a Scalene Triangle
- Area of Equilateral Triangles
- Perimeter of a triangle