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2. 2x + 3x = 90
5x = 90
x = 90/5 = 18
lkm = 2x = 2(18) = 36
lmk = 3x = 3(18) = 54
3. dae = 180 - 90 - aed = 90 - 46 = 44
bec = aed = 46
ebc = 180 - 90 - bec = 90 - 46 = 44
bac = 180 - 90 - 64 = 26
4. qr² = 17² - 8² = 225
qr = √225 = 15
5. psr = pqr = 54
trs = 180 - 67 - 54 = 59
qps = trs = 59
6. mst = mrt = 42
rts = rms = 58
mtr = 180 - 42 - 58 - 46 = 34
7. ac = bc
ac² = 2² + 2²
ac = √8 = 2√2