An equilateral triangle has sides of length 10 cm
1 answer:
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Step-by-step explanation:
<h2>This problem bothers on the mensuration of flat shapes, composite rectangle. </h2>The correct method for finding the area of a composite rectangle with a large rectangle and a small rectangle connected on the right side are highlighted below.
also see attached the rough sketch of the two rectangles.
- Decompose the figure into two rectangles and add the areas
- Extend the top and rightmost sides to make a larger rectangle, find its area, and then subtract the area of the removed corner.
- Decompose the figure into two rectangles, find their sum, and then subtract the area of the removed corner.
