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vanessajimenez361
12.03.2020 •
Mathematics
I need the answers to x & y for #14-18 . helpppp pleaseee
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Ответ:
14) The values of x= 7√3 and y= 14
15) The values of x= 16 and y= 16√3
16) The values of x= 3√2 and y= 3√2
17) The values of x= 11 and y= 22
18) The values of z= 24 x= 48/√3 and y= 24/√3
Step-by-step explanation:
The properties of Special Triangles :
For triangle 30° - 60° - 90°,
The side opposite to the angle 30° = aThe side opposite to the angle 60° = a√3The side opposite to the angle 90° = 2aFor triangle 45° - 45° - 90°,
The side opposite to the angle 45° = aThe side opposite to the angle 90° = a√214) The given triangle is 30° - 60° - 90°.
The side opposite to the angle 30° ⇒ a = 7
x is the side opposite to the angle 60° ⇒ a√3 = 7√3
y is the side opposite to the angle 90° ⇒ 2a = 14
15) The given triangle is 30° - 60° - 90°.
The side opposite to the angle 90° ⇒ 2a = 32
⇒ a = 32/2
⇒ a = 16
x is the side opposite to the angle 30° ⇒ a = 16
y is the side opposite to the angle 60° ⇒ a√3 = 16√3
16) The given triangle is 45° - 45° - 90°.
The side opposite to the angle 90° ⇒ a√2 = 6
⇒ a = 6/√2
⇒ a = 3√2
x and y are the sides opposite to 45° ⇒ a
Therefore, x = 3√2 and y = 3√2
17) The given triangle is 30° - 60° - 90°.
The side opposite to the angle 60° ⇒ a√3 = 11√3
⇒ a = 11
x is the side opposite to the angle 30° ⇒ a = 11
y is the side opposite to the angle 90° ⇒ 2a = 22
18) The left half of the triangle is 45° - 45° - 90°.
The side opposite to the angle 90° ⇒ a√2 = 24√2
⇒ a = 24.
z is the side opposite to 45° ⇒ a = 24
The right half of the triangle is 30° - 60° - 90°.
The side opposite to the angle 60° ⇒ a√3 = 24
⇒ a= 24/√3
x is the side opposite to the angle 90° ⇒ 2a = 48/√3
y is the side opposite to the angle 30° ⇒ a = 24/√3
Ответ:
The width is:
And the length is:
Step-by-step explanation:
Recall that the area of a rectangle is given by:
Where w is the width and l is the length.
We are given that the length of a rectangle is four meters longer than the width. Thus:
And we also know that the area of the rectangle is 22 square meteres.
Substitute:
Distribute and isolate the equation:
The equation isn't factorable, so we can instead use the quadratic formula:
In this case, a = 1, b = 4, and c = -22. Substitute:
Evaluate:
Thus, our two solutions are:
Since the width cannot be negative, we can ignore the second solution.
Since the length is four meters longer than the width:
Thus, the dimensions of the rectangle are:
Or, approximately 3.0990 by 7.0990.