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28 = 20 + EB
EB = 28-20 = 8
EC =
AC =
KLL ABCD = AE + EB + BC + CD + DA = 20 + 8 + 17 + 20 + 15 = 80
EB = 28 - 20 = 8 cm
EC² = BC² - EB²
= 17² - 8²
= 289 - 64
= 225
EC = 15 cm
AC² = EC² + AE²
= 15² + 20²
= 225 + 400
= 625
AC = 25 cm
keliling = AB + BC + CD + AD
= 28 + 17 + 20 + 15
= 80 cm
semoga membantu ya :)