An acute triangle is a type of triangle where all three angles are less than 90 degrees. This means that the triangle has no angle that is a right angle (90 degrees) or obtuse angle (greater than 90 degrees). In an acute triangle, all angles are acute, or less than 90 degrees.
.◂Math Worksheets and Study Guides Third Grade. Patterns
Study Guide
Patterns 
Worksheet/Answer key
Patterns Worksheet/Answer key
Patterns Worksheet/Answer key
Patterns Worksheet/Answer key
Pattern and Algebra Worksheet/Answer key
Patterns and Algebra Worksheet/Answer key
Patterns and Algebra
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyThe resources above cover the following skills:
Algebra (NCTM)
Understand patterns, relations, and functions.
Describe, extend, and make generalizations about geometric and numeric patterns.
Represent and analyze patterns and functions, using words, tables, and graphs.
Use mathematical models to represent and understand quantitative relationships.
Model problem situations with objects and use representations such as graphs, tables, and equations to draw conclusions.
Analyze change in various contexts.
Identify and describe situations with constant or varying rates of change and compare them.