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1/2 d1 d2 = 64
d1 d2 = 64 * 2
d1 d2 = 128
2x * x = 128
2x² = 128
x² = 128 / 2
x² = 64
x = √64
x = 8
panjang d1 = 8 * 2 = 16 cm
panjang d2 = 8 * 1 = 8 cm
panjang sisinya = √8² + 4²
= √64 + 16
= √80
= √16.√5
= 4√5 cm
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panjang alas = (√13²-12²) + 10 + (√13²-12²)
= (√169-144) + 10 + (√169-144)
= √25 + 10 + √25
= 5 + 10 + 5
= 20 cm
karena trapesium merupakan trapesium sama kaki, maka panjang dari tinggi ke ujungnya :
10 + 5
= 15 cm
panjang diagonal = √15² + 12²
= √225 + 144
= √369
= √9.√41
= 3√41 cm