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21 . 30 : 2 = 21 x 15 = 315
luas setengah lingkaran = 22/7 r² :2
22/7 * 10.5 * 10.5 : 2 = 173.25 = 173 1/4
jadi
315+173 1/4= 488 1/4 c
=½ x a x t
=½ x 21 x 30
=315 cm²
L setengah lingkaran
= ½ x phi x r²
= ½ x 22/7 x 10,5 x 10,5
= 1212,75 /7
=173,25 cm ²
L total= 315+173,25=488,25 atau 488¼ (c)