Panjang QR:

sisi tegak ΔQRS/sisi tegak ΔPQR = sisi miring ΔQRS/sisi miring ΔPQR

RS/QR = QR/PR

QR² = RS x PR

QR² = 8 x (4 + 8)

QR² = 8 x 12

QR = √96

QR = 4√6 cm

Panjang PQ:

PQ = √(PR² - QR²) = √(12² - (√96)²) = √(144 - 96) = √48 = 4√3 cm

Panjang QS:

sisi tegak ΔQRS/sisi tegak ΔPQR = sisi alas ΔQRS/sisi alas ΔPQR

RS/QR = QS/PQ

8/(4√6) = QS/(4√3)

QS(4√6) = 8(4√3)

QS(4√3√2) = 32√3

QS = (32√3)/(4√3√2)

QS = 32/(4√2)

QS = 8/(√2) cm

Panjang CD:

CD = √(BC² - BD²) = √(12² - 6²) = √(144 - 36) = √108 = 6√3 cm

Panjang AB:

sisi miring ΔBCD/sisi miring ΔABC = sisi alas ΔBCD/sisi alas ΔABC

BC/AB = BD/BC

BC² = AB x BD

12² = AB x 6

144 = AB x 6

AB = 144/6

AB = 24 cm