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The percentage of the area inside the square that is shaded is 55%.
<h3>What is the perimeter of the square?</h3>
Given: 
The perimeter of the square is 20Cm
Each side of the square is = 5Cm
Area = ( Length x Width )
(5 x 5) = 25 =Area
Area = 25 
Area of triangle 1 = (1/2) x 5 x (5 - 3) = 5 cm²
Area of triangle 2 = (1/2) x 5 x (5 - 3.5) = 6.25 cm²
Area of shaded portion = 25 - (5 + 6.25) = 13.75 cm²
Percentage of shade portion 
= (13.75 cm² / 25 cm²) x 100% 
= 55%
The percentage of the area inside the square that is shaded is 55%.
Learn more about area;
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Answer:
Step-by-step explanation:
The area of a trapezoid is the average of the parallel bases times the height.
A=h(a+b)/2 and since we have two identical trapezoids the total are will be
A=h(a+b) in this case
A=15(32+25)=855mm^2
 
        
             
        
        
        
63 due to .25 being 1/4 so 15 times four is 60 and 75 divided by 25 is 3