What is a Triangle?

A triangle is a closed shape with three sides and three angles. The sum of the angles in a triangle is always 180 degrees. Triangles are classified based on the lengths of their sides and the measures of their angles.

Types of Triangles

1. By Side Lengths: - Equilateral Triangle: A triangle with all three sides of equal length. - Isosceles Triangle: A triangle with at least two sides of equal length. - Scalene Triangle: A triangle with no equal sides.2. By Angles: - Acute Triangle: A triangle with all three angles less than 90 degrees. - Right Triangle: A triangle with one 90-degree angle. - Obtuse Triangle: A triangle with one angle greater than 90 degrees.

Formulas for Triangles:

1. Perimeter: The perimeter of a triangle is the sum of the lengths of its three sides. - Perimeter = Side1 + Side2 + Side32. Area: The area of a triangle can be calculated using the base and height. - Area = (1/2) * Base * Height3. Pythagorean Theorem: For a right-angled triangle, the Pythagorean theorem states: - a² + b² = c², where a and b are the lengths of the two shorter sides, and c is the length of the hypotenuse.

Study Guide:

◂Math Worksheets and Study Guides Fourth Grade. Calendar

Study Guide

Calendar

Activity Lesson

Calendar Calculations

Activity Lesson

Calendar Template & Yearly Activities

Research - Days & Months

The resources above cover the following skills:

Knowledge of Measurement: Students will identify attributes, units, or systems of measurements or apply a variety of techniques, formulas, tools, or technology for determining measurements.

Applications in Measurement: Apply measurement concepts.

Determine start time, elapsed time and end time (Assessment limit: Use hour and half hour intervals).