Tolong dijawab yang nomor 16

→ K = EF + DF + DE
70 = 25 + 17 + DE
DE = 70 - (25 + 17)
DE = 70 - 42
DE = 28

S = 1/2 K
S = 1/2 (70)
S = 35

L = √{s (s - a) (s - b) (s - c)
L = √ 35 (35 - 25) (35 - 17) (35 -28)
L = √ 35 (10) (18) (7)
L = √ 7 x 5 x 5 x 2 x 9 x 2 x 7
L = 7 x 5 x 2 x 3
L = 35 x 6
L = 210 cm²