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Penjelasan dengan langkah-langkah:

a. DC² = AC² – AB²

= 26² – 12²

DC = 10 (triple phytagoras 5, 12, 13)

b. Ladc = ½ . DC . AD

= ½ . 10 . 12

= 60 cm²

c. Labcd = 2 . Ladc

= 2 . 60

= 120 cm²

d. Labcd = ½ . BD . AC

120 = ½ . BD . 26

BD = 120 ÷ 13

= 9,23 cm

Jawaban:

A. dc = 30² – 24²

= 900 – 576

= 324

dc² = √324

= 18

B. L.adc = 1/2 × bo × ao

= 1/2 × 18 × 30

= 270

C. L. layang-layang : abcd = 2 × L.adc

= 2 × 270

= 540

D. panjang tali busur = 1/2 × oa × bc

540 = 1/2 × 30 × bc

540 = 15 bc

bc = 540/15

= 36