Mencari luas= Lingkaran=

r = 28 cm
v. lingkaran = π x r x r

karena model 1/4 lingkaran, jadi rumusnya
1/4 x π x r x r
= 1/4 x 22/7 x 28 x 28
= 616 cm2

keliling = 2 x π x r
= 2 x 22/7 x 28
= 176 cm