Answer:
66.5 square feet
Explanation:
See the given diagram attached with this question.
The right trapezoid consists of two parts, one square area having side length 7 ft and a right triangle having base 5 ft and altitude 7 ft.
Therefore, the area of the doghouse which is in shape of the given right trapezoid will be = area of the square + area of the triangle
= ( 7 × 7) + ( 0.5 × base × altitude )
= ( 7 × 7) + ( 0.5 × 5 × 7 )
= 49 + 17.5
= 66.5 square feet. (Answer)