Calculate perimeteter of the semicircle then divide mathematically by seven using a calculator and then using that value and a divider or compass divide the semicircle.......
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To divide a rectangle into 7 parts using 3 lines: Use 2 lines to draw two diagonals. Use the third line to draw a parallel line to any of the sides but not passing through the centre. This will create 7 parts in the rectangle.
Make a horizontal line and vertical line through the circle. You now have 4 parts. Make a line from the center to the edge of the circle in 3 of these parts and you now have 7 parts.
if you add, subtract, multiply and divide all the problems correctly, it will equal 7
x= 10.5 3/x = 2/7 so multiplying by 7 this is the same as 21/x =2. Multiply by x to get 21=2x. Divide by 2 to get 10.5 = x
The same way you divide positive exponents like ( x^-7 ) / ( x^-12) = x^( -7 - - 12) = x^( -7+12) = x^5