no 1 sapai 5 ya tolong bantuannya

1.
QT/PQ = ST/PR
QT/(QT + 3) = 8/12
QT × 12 = 8 × (QT + 3)
12QT = 8QT + 24
12QT - 8QT = 24
4QT = 24
QT = 24/4
QT = 6 cm

2.
AB/DE = AC/DF
4/DE = 6/24
4 × 24 = 6 × DE
96 = 6DE
DE = 96/6
DE = 16 cm

3.
(TU - SR)/(PQ - SR) = ST/SP
(TU - 10)/(18 - 10) = 5/(5 + 3)
(TU - 10)/8 = 5/8
(TU - 10) × 8 = 5 × 8
8TU - 80 = 40
8TU = 40 + 80
8TU = 120
TU = 120/8
TU = 15 cm

4.
t1/l1 = t2/l2
24/32 = t2/96
24 × 96 = t2 × 32
2304 = 32t2
t2 = 2304/32
t2 = 72 cm

5.
a.
(CD)^2 = AD × BD
(CD)^2 = 4 × 9
(CD)^2 = 36
CD = V36
CD = 6 cm

b.
L = 1/2 × AB × CD
L = 1/2 × (4 + 9) × 6
L = 1/2 × 13 × 6
L = 39 cm^2