Mathematics 10 — Exercise 9.1 · Q7

Full question

Two circles of radii 5 cm and 7 cm touch externally. Find the distance between centres.

Step-by-step solution

1. For external contact, add the two radii.

2. Substitute the given numbers into the formula.

   $$7+5$$

3. Calculate this operation before combining the remaining terms.

   $$7+5=12$$

4. The required result is shown below. Unit: cm

   $$12$$

Answer

The final answer is shown below.