cari luas dan keliling pakai cara

keliling = 3/4 x 2 x phi x r
            = 3/4 x 2 x 22/7 x 35
            = 660/4 = 165 cm

luas = 3/4 x phi x r x r
        = 3/4 x 22/7 x 35 x 35
        = 1150/4 = 287,5 cm2

semoga bermanfaat