A.
1. PO ≅ PO
2. NO ≅ MP
If mNO = 15, then mMP = 15
3. NP ≅ MO
If mNP = 12, then mMO = 12
4. NO ≅ MP
If NO = x + 5 and MP = 4,
x + 5 = 4
x = 4 - 5
x = -1
5. NP ≅ MO
If mmNP = 5x + 1 and MO = x + 9
5x + 1 = x + 9
5x - x = 9 - 1
4x = 8
4x/4 = 8/4
x = 2
B.
6. RO ≅ TX
7. XS ≅ OS
8. RT = RS + ST (CPCTC)
If RT = 30
ST = 30/2
ST = 15
9. RO ≅ TX
If RO = 4 + x and TX = 5,
4 + x = 5
x = 5 - 4
x = 1
10. OS ≅ XS
If OS = 3x - 5 and XS = -2x,
3x - 5 = -2x
3x + 2x = 5
5x = 5
5x/5 = 5/5
x = 1
