Mohon bantuannya terimakasihh
CE = BC = 18 cm
AB =
[tex] \sqrt{30 {}^{2} - 18 {}^{2} } [/tex]
AB =
[tex] \sqrt{900 - 324}[/tex]
AB =
[tex] \sqrt{576} [/tex]
AB = 24 cm
AB = DC = 24 cm
AC = DE = 30 cm
Maka :
a. Luas CDE
= 18/2×24
= 216 cm^2
b. Keliling bangun
= 24 + 18 + 24 + 30 + 12
= 108 cm
Semoga membantu
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