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= √225 - 81
= √ 144
af = 12 cm
dc = 9 cm
cb = ad =√9² + 3²
= √81 + 9
= √90
= 3√10 cm
Kll = jumlah semua sisi
= 9 +15 + 3√10 + 3√10
= 24 +6√10 cm d
AF² = 15² - 9²
= 225 - 81
=144
AF = √144
= 12
BC² = 9² + 3²
= 81 + 9
= 90
BC = √90
= √9√10
BC = AD = 3√10
AE = BF = 3
DC = AF - AE
= 12 - 3
= 9
Keliling
= AB + BC + CD + AD
= 15 + 3√10 + 9 + 3√10
= 24 + 6√10 ==> C