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5. Se-kongruen berarti sama persis. Maka QR = BC = ...?
Bila dari C digambar garis tegak lurus kebawah dan ditulis titik X, maka terdapat segitiga siku siku XBC, dengan :
XB = AB - AX
XB = 21 - 12
XB = 9
Nilai AX didapatkan dari :
AX = CD = AD
AX = 12
XC = AD = 12
Maka,
BC² = XC² + XB²
BC² = 12² + 9²
BC = 15
MAKA QR = BC = 15