Chapter 1 - Section 1.10 - Addition and Subtraction of Decimal Fractions - Exercises - Page 62: 55

$a = 4.56$ cm $b = 4.87$ cm

Step 1. Find side $a$. Side $a$ is the sum of the 1.87 cm-piece and the 2.69 cm-piece. So $a = 1.87 cm + 2.69 cm$ $a = 4.56 cm$ Step 2. Find side $b$. Side $b$ is the 8.32 cm length minus the 3.45 cm-piece we already know. So $b = 8.32 cm - 3.45 cm$ $b = 4.87 cm$