Question

Using the Pythagoras theorem find the length of the missing side.

• A. 10 cm
• B. 12 cm
• C. 7 cm
• D. 15 cm

Answer 1

The correct option is D 15 cm

${AB}^2+{BC}^2={AC}^2$
$9^2+{12}^2={AC}^2$
$81+144={AC}^2$
$225={AC}^2$
${15}^2={AC}^2$
$AC=15$