NO 7-10 plis pake cara bsk dikumpulin

no 10.
S = 1/2 ( 20 + 21 + 29 )
= ( 70) 1/2
= 35

L = 35 ( 35 - 20 ) ( 35 - 21 ) ( 35 - 29 )
= 35 ( 15 ) ( 14 ) ( 6 )
= 7350
= ( akar dari 7350 )
= 210

maaf saya tau cman yg no 10 aja.