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Verified answer
Luas trapesium = 1/2 (a + c ) x t180 = 1/2 (10 + 20) x t
180 = 15 t
t = 180 / 15
t = 12 cm
karena trapesium sama kaki maka alasnya = (20 - 10) : 2 = 5 cm
sehinga alasnya besarnya 5 + 10 + 5 = 20 cm
sisi miring = √(12² + 5²) = √(144 + 25) = √169 = 13 cm
keliling trapesium = 20 + 13 + 10 + 13
= 56 cm