Find the area of equilateral triangle

3·1/2·4^2·SIN(1/3·360°) = 20.78

 The required area of the given equilateral triangle is 20.78 ft².

Step-by-step explanation:  We are given to find the area of the equilateral triangle shown in the figure.

We know that the area of an equilateral triangle having radius of circumscribed circle equal to r units is given by

For the given equilateral triangle, we have

r = 4 ft.

Therefore, the area of the given equilateral triangle is

Thus, the required area of the given equilateral triangle is 20.78 ft².

total amount of money that he should pay if he has not used his duty free exemption is $98

step-by-step explanation:

given a united states citizen returning to the states declares the following items at the customs office: 3 shirts at $8.50 each 2 dresses at $27.50 each 1 pair of gold cuff links at $17.50 per pair. we have to find how much he pay

cost of 3 shirts if one cost at $8.50 is

cost of 2 dresses if one cost at $27.50 is  

cost of 1 pair of gold cuff at $17.50

so, total amount of money that he should pay if he has not used his duty free exemption is   $25.5+$55+$17.50=$98