Subject: General Aptitude · Chapter: Area · Exam: 2009 · Marks: · Difficulty:
The area of a triangle whose sides are of lengths 3 cm, 4 cm and 5 cm is
(a)$8 \mathrm{cm}^{2}$
(b)$6 \mathrm{cm}^{2}$
(c)$10 \mathrm{cm}^{2}$
(d)None of these
Answer
Answer (as printed): B
Explanation
Since $3^{2}+4^{2}=5^{2}$, so it is a right-angled triangle with Base $=3 \mathrm{cm}$ and Height $=4 \mathrm{cm}$. $\therefore \quad$ Area $=\left(\frac{1}{2} \times 3 \times 4\right) \mathrm{cm}^{2}=6 \mathrm{cm}^{2}$.