Shenzhen elementary school sixth grade math problem! Urgent! ! ! Come in, master!
The area of the shaded part is equal to the area of the triangle minus the area of three sectors, and the sum of the areas of the three sectors is equal to the area of a semicircle with a radius of 1cm, so the area of the shaded part is equal to1/2 * 3 * 4-1/2 * n *1(square) n = 3.655.