Tolong banget ya kak... terima Kasih...

9. 15² - 9²
= 225 - 81
= √144
= 12 cm ( BD )

CD = 5² + 12²
= 25 + 144
= √169
= 13 cm ( CD )

10. BD = 13² - 5²
= 169 - 25
= √144
= 12 cm ( BD )

CD = 12 / 2 = 6 cm

CE = 6² + (13 - 5)²
= 6² + 8²
= 36 + 64
= √100
= 10 cm

maaf kalau salah. semoga bermanfaat.