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The formula for finding the area of a triangle is A=(1/2)BxH.
B is the base of the circle and H is the height.

www.mathgoodies.com/lessons/vol1/area_triangle.html

The area of a polygon is the number of square units inside that polygon. Area is 2 -dimensional like a carpet or an area rug. A triangle is a three-sided polygon.

www.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/area-triangle/v/intuition-for-area-of-a-triangle

Understand why the formula for the area of a triangle is one half base times height, which is half of the area of a parallelogram.

www.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/area-triangle/a/area-of-triangle

Intuition for why the area of a triangle is one half of base times height.

www.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/area-triangle/v/example-finding-area-of-triangle

[Instructor] What is the area of the triangle? And they're talking about this triangle here. And like always, pause this video and see if you can figure it out on your ...

www.mathwarehouse.com/geometry/triangles/area/index.php

Area of a Triangle tutorial. Pictures, examples and many practice problems on how to find the area of a triangle from its base and its height.

www.mathsisfun.com/algebra/trig-area-triangle-without-right-angle.html

Example: What is the area of this triangle? Triangle (Note: 12 is the height, not the length of the left-hand side). Height = h = 12. Base = b = 20. Area = ½ bh = ½  ...

www.virtualnerd.com/pre-algebra/perimeter-area-volume/perimeter-and-area/area-formulas-examples/triangle-area-example

www2.clarku.edu/~djoyce/trig/area.html

There are several ways to compute the area of a triangle. For instance, there's the basic formula that the area of a triangle is half the base times the height.

www.mathopenref.com/trianglearea.html

The conventional method of calculating the area of a triangle (half base times altitude) with pointers to other methods and special formula for equilateral ...