MCQ
Mark $(\checkmark)$ against the correct answer.$\triangle\text{ABC}$ is right angled at $A.$ If $AB = 24\ cm$ and $AC = 7\ cm,$ then $BC = ?$
- A$31\ cm.$
- B$17\ cm.$
- ✓$25\ cm.$
- D$28\ cm.$
✓
Answer
Correct option: C.
$25\ cm.$
$\triangle \mathrm{ABC}$, is a right angled, $\angle \mathrm{A}=90^{\circ}$
$A B=24 \mathrm{~cm}, A C=7 \mathrm{~cm}$
$\text { but } B C^2=A B^2+A C^2$
$\Rightarrow B C=(24)^2+(7)^2=576+49=625=(25)^2$
$B C=25 \mathrm{~cm}$
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