The three sides of a triangular field are 20 metres, 21 metres and 29 metres long respectively. The area of… · ABC26GN4457
Subject: General Aptitude · Chapter: Area · Exam: I.I.F.T. 2005
The three sides of a triangular field are 20 metres, 21 metres and 29 metres long respectively. The area of the field is
(a)210 sq. m
(b)215 sq. m
(c)230 sq. m
(d)None of these
Answer
Answer (as printed): A
Explanation
Since $(20)^{2}+(21)^{2}=(29)^{2}$, so it is a right-angled triangle with Base $=20 \mathrm{m}$ Height $=21 \mathrm{m}$. ∴ Area $=\left(\frac{1}{2} \times 20 \times 21\right) \mathrm{m}^{2}=210 \mathrm{m}^{2}$.