Area - circles, sectors and segments

What fractions of the largest circle are the two shaded regions?

What is the total area enclosed by the three semicicles?

If I print this page which shape will require the more yellow ink?

A white cross is placed symmetrically in a red disc with the central square of side length sqrt 2 and the arms of the cross of length 1 unit. What is the area of the disc still showing?

Prove that the shaded area of the semicircle is equal to the area of the inner circle.

A floor is covered by a tessellation of equilateral triangles, each having three equal arcs inside it. What proportion of the area of the tessellation is shaded?

Bluey-green, white and transparent squares with a few odd bits of shapes around the perimeter. But, how many squares are there of each type in the complete circle? Study the picture and make an estimate.

Four quadrants are drawn centred at the vertices of a square . Find the area of the central region bounded by the four arcs.