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# Geometry Basics: Angles, Quadrilaterals, and Triangles

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@SpellbindingTrumpet

360 degrees

Reflex Angle

### What is the term for two angles that add up to 90 degrees?

Complementary Angles

### What is the name of the quadrilateral with all sides of equal length?

<p>Rhombus</p> Signup and view all the answers

### What is the term for the diagonal of a rectangle that bisects each other?

<p>Perpendicular Bisector</p> Signup and view all the answers

### What is the sum of the interior angles in a triangle?

<p>180 degrees</p> Signup and view all the answers

### What is the name of the triangle with all sides of equal length?

<p>Equilateral Triangle</p> Signup and view all the answers

### What is the name of the theorem that states the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides?

<p>Pythagorean Theorem</p> Signup and view all the answers

### What is the term for two angles that add up to 180 degrees?

<p>Supplementary Angles</p> Signup and view all the answers

### What is the name of the quadrilateral with two pairs of opposite sides?

<p>Trapezoid</p> Signup and view all the answers

## Study Notes

### Angles

• Types of Angles:
• Acute Angle: Less than 90 degrees
• Right Angle: Exactly 90 degrees
• Obtuse Angle: Greater than 90 degrees but less than 180 degrees
• Straight Angle: Exactly 180 degrees
• Reflex Angle: Greater than 180 degrees but less than 360 degrees
• Angle Relationships:
• Complementary Angles: Two angles that add up to 90 degrees
• Supplementary Angles: Two angles that add up to 180 degrees
• Vertical Angles: Two angles formed by two intersecting lines
• Adjacent Angles: Two angles that share a common vertex and side

• Definition: A quadrilateral is a polygon with four sides
• Rectangle: A quadrilateral with all right angles and opposite sides of equal length
• Square: A rectangle with all sides of equal length
• Rhombus: A quadrilateral with all sides of equal length
• Trapezoid: A quadrilateral with two pairs of opposite sides
• Kite: A quadrilateral with two pairs of adjacent sides of equal length
• Properties:
• Sum of interior angles: 360 degrees
• Diagonals: Bisect each other in a rectangle and rhombus

### Triangles

• Types of Triangles:
• Equilateral Triangle: A triangle with all sides of equal length
• Isosceles Triangle: A triangle with two sides of equal length
• Scalene Triangle: A triangle with all sides of different lengths
• Right Triangle: A triangle with one right angle
• Properties:
• Sum of interior angles: 180 degrees
• Angle-Side Relationships:
• The sum of any two sides is greater than the third side
• The square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides (Pythagorean Theorem)
• Triangle Inequalities:
• The length of any side is less than the sum of the lengths of the other two sides
• The length of any side is greater than the difference of the lengths of the other two sides

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## Description

Test your understanding of fundamental geometry concepts, including types of angles, quadrilaterals, and triangles, as well as their properties and relationships. Covers acute, right, obtuse, and reflex angles, and various types of quadrilaterals and triangles.

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