A. 18 cmb. 15 cmc. 13 cmd. 12 cm​

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A. 18 cmb. 15 cmc. 13 cmd. 12 cm​

A. 18 cmb. 15 cmc. 13 cmd. 12 cm​

Penyelesaian

  • Panjang EH

EH = CD
EH = 9 cm

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  • Panjang HF

HF / BG = CF / (CF + BF)

HF / 10 = 4 / (4 + 6)

HF / 10 = 4 / 10

HF / 10 = 2 / 5

5 HF = 2 × 10

5 HF = 20

HF = 20 ÷ 5

HF = 4 cm

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  • Panjang EF

EF = EH + HF

EF = 9 + 4

EF = 13 cm (C)