Answer:
Area of window=195sq inches
Explanation:
Since, it is an isosceles trapezoid, then area of an isosceles triangle is given by:
, where a and b are the two parallel sides of the triangle and h is the height of an isosceles triangle.
Now, a= 10 inches and b= 3+3+10=16 inches and h=15 inches.
Therefore, Area of isosceles triangle=

=

=

Therefore, area of an isosceles triangle= 195sq inches.