How many square feet bigger is figure a than figure b? a. 319.5 b. 315 c. 4.5 d. 5.4

Option: C is the correct answer.

            C.   4.5

Step-by-step explanation:

Figure A--

It consist of a trapezium over a square of side 15 ft.

Total figure of Figure is:

Area of Trapezium+Area of square.

We know that:

Area of Trapezium is:

1/2 ×(sum of bases)×Height

=1/2×(12+15)×7

=94.5 squre ft.

Area of square is:

(Side)²

=(15)²

=225 square ft.

Hence, Total area of figure A is:

225+94.5

=319.5 square ft.

Figure B--

Area of figure B is:

Area of square+Area of equilateral triangle.

= (15)²+1/2×15×12

=225+90

=315 square ft.

Hence, the difference in the area of two figure is:

               319.5-315

           =4.5 square ft.

answer: 20

step-by-step explanation: