The trick here is to not use sin and cos at all.
The -13/15 is the x coordinate of a line from the origin to the unit circle (the line with angle theta). That happens to be the cos(theta).
The y coordinate is the sin(theta).
You can draw this as a triangle where x^2 + y^2 = 1.
So y = √(1 - (13/15)^2) ≈ 0.49889. But your exact answer should be:
Answer:
Area of triangle = 4 ft²
Area of rectangle =
Area of irregular figure =
Step-by-step explanation:
Answer:
42
Step-by-step explanation:
let's make the missing number x
multiply 3 on both sides to get rid of the fraction, 41 × 3 = 123
simplify the right side, 48 + 33 = 81
subtract 81 on both sides