42 centimeters squared.
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1080cm2
It is a right angle triangle because it complies with Pythagoras' theorem. Area = 1/2*30*40 = 600 square cm
The area of triangle is : 18.0
35cm2
Area of a triangle is 1/2 * base * height, so .5 * 5.5 * 8.8 = 24.2