okay so first you need to find the height of the triangle (pythagorean theorm) a^2+b^2=c^2 so here we're looking for b 2^2 + b^2= 4^2 4+ b^2= 16 -4 -4 b^2=12 square root both b=appx 3.4 now we have the height and the base area formula for a triangle is 1/2bh 4*3.4= 13.6 since there are 3 shaded triangles multiply by 3 13.6*3= 40.8 so the total area shaded is 40.8 hape this helped have a great day!!!
