Then measure the radius of the blue semicircle and calculate its area? S=πR^2/2
The area of the drawing part is the difference between the two areas.
Measure the length and width of a rectangle, and then you can calculate its area? S=ab
A rectangle is the diameter of a semicircle. Divided by 2, it is the radius of the semicircle, and its area can be calculated. S=πr^2/2
The area of the drawing part is the sum of the two areas.
You can calculate the area of a semicircle by measuring its radius? S=πr^2/2
The radius of the semicircle is the height of the white triangle, and the area of the white triangle is S=2a*a/2.
The area of the drawing part is the difference between the two areas.