Question

10. Find the area of an equilateral
triangle whose side is 5 cm.
a) 45.45 cm2
b) 10.825 cm2
c) 7.45 cm
d) None of the above.​

Answer 1

Step-by-step explanation:

NONE OF THE ABOVE IS THE ANSWER.

THE CORRECT ANSWER IS IN THE ATTACHMENT

Answer 2

Given : S= 5 cm

To find : Area of equilateral triangle

Formula used - $\large \frac{ \sqrt{ 3 } }{ 4 } a ^ { 2 }$

Solution : $\large \frac{ \sqrt{ 3 } }{ 4 } \times 5 ^ { 2 }$

= $\large \frac{ 25 \sqrt{ 3 } }{ 4 } cm ^ { 2 }$

= $\large 10.825 cm ^{2}$

Hence, B is the correct answer.