In diagram below, ABC is a semicircle with centre O.
Calculate the area, in cm2 , of the shaded region.
In diagram below, ABC is an arc of a circle centre O
The radius of the circle is 14 cm and AD = 2 DE.
Calculate the perimeter, in cm, of the whole diagram.
In diagram below, KLMN is a square and KLON is a quadrant of a circle with centre K.
Calculate the area, in cm2, of the coloured region.