7th Class
Mathematics
Mensuration
Question Bank
Mensuration
question_answer
The area of an isosceles triangle with equal sides 5.1 meters and the third side 4.6 meters is
A)10.47 sq. m
B)2.86 sq. m
C)10.45 sq. 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\[\Delta \,ABC=2.3\times 4.55=10.47\,\text{sq}\text{.}\,\text{m}\text{.}\]