he area of the triangle. A triangle with length of sides 10 meters, 10.54 meters, and 11 meters is shown. The height of the triangle is 8.66 meters.

The area of a triangle can be found by the formula
a = \frac{1}{2} \times b \times h
If the base of the triangle is 10 m, then the area would be,
a = \frac{1}{2}\times 10 \times 8.66 m = 43.3 m
I found an answer from www.quora.com
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I found an answer from ntrs.nasa.gov
Surface Topography of the Greenland Ice Sheet from Satellite Radar ...
Solid triangles indicate elevation of second return when retracking algorithm indicated ... dulations of 5-meter peak-to-trough amplitude with 10-kil-.
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I found an answer from www.khanacademy.org
Area of triangles (article) | Geometry | Khan Academy
Math: 6.G.A.1. Intuition for why the area of a triangle is one half of base times height. ... I find math in general fun, because it gets my brain working!
For more information, see Area of triangles (article) | Geometry | Khan Academy