6th Class
Mathematics
Mensuration
Question Bank
Menstruation
question_answer
The area of a triangle with each side equals 5.1 metres and the third side 4.6 metres is
A) 10.47sq. m
B) 2.86 sq. m
C) 10.45sq. m
D) None of these
Correct Answer:
A
Solution :
In right angled \[\Delta \,ADC,\] \[AD=\sqrt{{{(5.1)}^{2}}-{{(2.3)}^{2}}}\,=4.55\,m\] \[\therefore \] Area of \[\Delta ABC=\frac{1}{3}\times 4.6\times 4.55\] \[=2.3\,\times 4.55\,=10.47\,sq.\,m.\]