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Interactive
Curated OER

Area of Shaded Region (rectangles and triangles)

For Students 9th - 12th
For this online math worksheet, high schoolers determine the area of shaded regions within rectangles and triangles. This excellent resource allows the students to check their answers, and to get "hints" should they run into...
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Interactive
Curated OER

Triangle Problems - Find the Height given the Area

For Students 9th - 12th
In this online math worksheet, students find the height of 5 triangles given their area. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A terrific teaching tool!
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Worksheet
Curated OER

Six Find the Area of Triangles Given the Vertices Problems

For Students 8th - 11th
In this area of a triangle activity, students calculate the area of six triangles given the coordinate of the vertices. Grids are provided.
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Worksheet
Curated OER

Area of Triangle Worksheet

For Students 5th - 6th
In this area worksheet, students find the area of a triangle given the height and the base. They also find the height or base given the area of the triangle. 
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Lesson Plan
Curated OER

Area of a Triangle

For Teachers 10th - 11th
Students solve the area of triangles. For this precalculus lesson, students are given two sides of a triangle and asked to calculate the area. They apply the law of sine and the side-angle-side area formula to solve.
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Worksheet
Curated OER

Using Trigonometry to Find Area

For Students 11th - 12th
In this Algebra II/Trigonometry learning exercise, students use trigonometry to determine the area of a triangle or a parallelogram.  The one page learning exercise contains ten problems.  Answers are not provided. 
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Lesson Plan
Curated OER

Area of a Triangle

For Teachers 9th - 11th
In this geometry worksheet, students solve problems by finding the area of a triangle. They are given the sides and asked to solve using the Pythagorean Theorem. There are 72 problems.
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Lesson Plan
Curated OER

Finding the Area of a Triangle

For Teachers 5th
Fifth graders investigate the area of a triangle. In this geometry lesson, 5th graders practice finding the area of a triangle using the correct formula: 1/2bh.
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Worksheet
Curated OER

Perimeter, Circumference, Volume, and Surface Area

For Students 8th - 11th
In this Perimeter, Circumference, Volume, and Surface Area worksheet, students are asked to identify geometric formulas and calculate for volume and surface area for geometric solids.  In addition, students are asked to identify...
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Worksheet
Curated OER

Heron's or Hero's Formula for Area of Scalene Triangle

For Students 7th - 8th
In this Heron's or Hero's formula for area of scalene triangle worksheet, students solve 4 word problems using the formula given for area of a triangle.
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Lesson Plan
Curated OER

Triangle in the Matrix

For Teachers 9th - 12th Standards
Young mathematicians represent a triangle with a matrix and use the determinant to find the area of three given triangles. Learners also verify the formula for area of a triangle. 
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Lesson Plan
Curated OER

Triangle Attributes and Measures

For Teachers 7th
Seventh graders explore the concept of triangles. In this triangles lesson plan, 7th graders sort triangles according to various attributes such as acute, obtuse, isosceles, or equilateral. Students find the area and perimeter of triangles.
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Lesson Plan
Curated OER

Perimeter and Area 8

For Teachers 5th - 7th
In this calculating area worksheet, young scholars use their problem solving skills and the information provided to find the area of 6 triangles.
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Worksheet
Curated OER

Perimeter and Area of Triangles (B)

For Students 4th - 5th
For this geometry worksheet, students calculate the perimeter and area for each of 4 triangles using the given measurements. They work with measurements that are labeled in centimeters.
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Worksheet
Curated OER

Hands On: Area of Triangles

For Students 5th - 7th
In this area of triangles practice worksheet, students sharpen their problem solving skills as they solve 6 story problems.
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Worksheet
Curated OER

Quiz: Areas and Coordinate Geometry

For Students 8th - Higher Ed
In this area worksheet, students find the area of ten figures that are drawn on a coordinate grid. Five of the shapes are triangles. Five shapes are irregular quadrilaterals.
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Lesson Plan
Curated OER

Triangle Explorer

For Teachers 3rd - 6th
Students compute the area of triangles in a computer program. In this measurement lesson plan, students complete 5 easy, 5 medium, and 5 hard problems.
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Worksheet
Curated OER

Perimeter and Area of Triangles 2

For Students 5th
In this measurement learning exercise, 5th graders study the different triangles and then use the given measurements to find the perimeter and area for each.
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Worksheet
Curated OER

The Area of a Triangle

For Students 5th - 6th
In this area of a triangle worksheet, students solve 30 problems in which the area of triangles are calculated. There is instruction on the page. This is intended for on-line use but can be done on paper.