# Thread: Need Help with complex fractions

Now i just need the SAT question and the triangle one.

For the triangle question. Use cosine rule to find an angle between any of the two sides, and then use the formula (1/2)absin(theta) for the area.

for instance. let the sides be a, b and c. the angle between a and b is given by:

c^2 = a^2 + b^2 - 2abcos(C), where C is the angle between a and b. Solve for C.

then, use the formula A = (1/2)absin(C) to find the area

Now i just need the SAT question and the triangle one.
I believe the answer to 5 is 10*10*26*26*10*10*10 = (10^5)(26^2) = 67600000 = 6.76 x 10^7

Since you have a choice of 10 digits for the first number, and also 10 digits for the second, since numbers can be repeated, and so on. Similarly, you have 26 letters to choose from for the first letter, and since letters can be repeated, you also have 26 to choose from for the second letter.