From the corner

Area


= (3/4 x 42 + 1/4 x 22 + 1/4 x 12)p

= 1/4(48 + 4 + 1)p

1 = /4(53)p

1 = 3 1/4p

Middle of longest

Area


= (1/2 x 42 + 2 x 1/4 x 2.52 + 2 x 1/4 x 0.52)p

= 11 1/4 p

Middle of shortest

Area


= (1/2 x 42 + 2 x 1/4 x 32)p

= 12 1/2 p