keliling daerah yg diarsir adalah.....cm (22/7)

sisi setengah lingkaran = 1/2 × π × d
= 1/2 × 22/7 × 21
= 33 cm .
keliling = ( 24 + 21 ) + 47 + 24 + 33 + ( 47 - 21 )
= 45 + 47 + 24 + 33 + 26
= 176 cm .