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66 = 40 + 2x
66-40= 2x
26 = 2x
x = 26 : 2 = 13 cm
Jadi,sisi miringnya = 13 cm
Tinggi trapesium = √13²-5² = 12 cm
*5 itu dari (25-15) :2
Luas trapesium = 1/2 (a+b) x t
1/2 (25+15) x 12
1/2 x 40 x 12
240 cm²
Kll = 15 + 25 + x + x
66 = 15 + 25 + 2x
66 = 40 + 2x
2x = 66 - 40
2x= 26
x = 13
jadi sisi miringnya 13 cm
alas segitiga = 25 - 15
= 10/2 (karena ada dua segitiga )
= 5
Tinggi trapesium = = 12 cm
L = 1/2 ( a + b ) t
L = 1/2 ( 25 + 15 ) 12
L = 1/2 ( 40 ) 12
L = 20 . 12
L = 240 cm2