The general formula to calculate area of a trapezoid ( and an isosceles trapezoid) is:
AREA=(Sum of parallel sides)(Distance between parallel sides)/2. And if you find this formula difficult, calculate separately the area of two right angled triangles and a rectangles. For more details, contact at saqibahmad81@Yahoo.com
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by the formula of ---A*b
you dont
There is no simple formula and, in any case, the answer will depend on what information about the trapezoid is given.
Use a protractor and you'll find base angles are equal and that the 4 interior angles add up to 360 degrees
It is a cross section of the Earth. It has no specific name. You can find one at the link below