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Area of a triangle from surrounding rectangle

This math skill teaches how to calculate the area of a triangle by envisioning it within a surrounding rectangle. The triangle's area is deduced by determining that it occupies half the area of the rectangle.

Learn area of a triangle from surrounding rectangle

Teaching Transcript

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Let's find the area of this triangle

One way to think about it is to draw a 6 by 5 rectangle around the triangle with an area of 30

The triangle fills half the rectangle, so an area of 15

Skill Practice

Area of a triangle from surrounding rectangle

Test your understanding of area of a triangle from surrounding rectangle by practicing it! Work through the below exercises to use it in practice.