Write True or False and justify your answer.
In a triangle,the sides are given as $11 \, cm$,$12 \, cm$,and $13 \, cm$. The length of the altitude corresponding to the side of length $12 \, cm$ is $10.25 \, cm$.

Vedclass pdf generator app on play store
Vedclass iOS app on app store
(A) Let the sides of the triangle be $a = 11 \, cm$,$b = 12 \, cm$,and $c = 13 \, cm$.
The semi-perimeter $s$ is calculated as:
$s = \frac{a + b + c}{2} = \frac{11 + 12 + 13}{2} = \frac{36}{2} = 18 \, cm$.
Using Heron's formula,the area of the triangle is:
$\text{Area} = \sqrt{s(s-a)(s-b)(s-c)} = \sqrt{18(18-11)(18-12)(18-13)}$
$= \sqrt{18 \times 7 \times 6 \times 5} = \sqrt{3780} = \sqrt{36 \times 105} = 6\sqrt{105} \, cm^2$.
We know that $\text{Area} = \frac{1}{2} \times \text{base} \times \text{altitude}$.
Given the base is $12 \, cm$,let the altitude be $h$:
$6\sqrt{105} = \frac{1}{2} \times 12 \times h$
$6\sqrt{105} = 6h$
$h = \sqrt{105} \, cm$.
Since $\sqrt{100} = 10$ and $\sqrt{121} = 11$,$\sqrt{105} \approx 10.2469 \, cm$,which is approximately $10.25 \, cm$.
Thus,the given statement is True.

Explore More

Similar Questions

The triangular side walls of a flyover have been used for advertisements. The sides of the walls are $13 \, m$,$14 \, m$,and $15 \, m$. The advertisements yield an earning of $Rs \, 2000$ per $m^2$ a year. $A$ company hired one of its walls for $6$ months. How much rent did it pay? (in $Rs$)

Difficult
View Solution

Calculate the area of the shaded region in the figure.

Difficult
View Solution

Write True or False and justify your answer.
The area of the isosceles triangle is $\frac{5}{4} \sqrt{11} \, cm^2$,if the perimeter is $11 \, cm$ and the base is $5 \, cm$.

Find the area of the triangle with the length of the sides $9 \, cm$,$10 \, cm$,and $17 \, cm$. (in $, cm^2$)

$A$ field is in the shape of a trapezium having parallel sides $90 \, m$ and $30 \, m$. These sides meet the third side at right angles. The length of the fourth side is $100 \, m$. If it costs $\operatorname{Rs} 4$ to plough $1 \, m^2$ of the field,find the total cost of ploughing the field (in $\operatorname{Rs}$).

Difficult
View Solution

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo