a) MN = MN = x
MP² = x² + x²
18² = 2x²
324 = 2x²
x² = 162
x =9√2 ⇒ MN = 9√2 cm
b) MN = MN = x
MP² = x² + x²
(4√2)² = 2x²
32 = 2x²
x² = 16
x =4 ⇒ MN = 4 cm
c) NP = MN = 8
MP² = 8² + 8²
MP² = 64 + 64
MP = 8√2 cm
d) NP = MN = 10√2
MP² = (10√2)² + (10√2)²
MP² = 200+ 200
MP = 20 cm