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1 answer:
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Answer:
XS is 9 inches long.
Step-by-step explanation:
Given that
YS is the perpendicular bisector of XZ.
Length of XZ = 18 inches
To find:
Length of XS = ?
Solution:
First of all, let us learn about the perpendicular bisector.
Perpendicular bisector of a line <em>AB</em> is a line <em>PQ</em>, which divides the line AB in two equal parts and is at an angle of with the line AB.
If B is on the line PQ, then and
Applying the above property in our given question.
Kindly refer to the attached image for the given dimensions.
S is on the line XZ.
So, the answer is XS is 9 inches long.
Answer:
C)
Step-by-step explanation:
By the cos double angle formula, we know Substituting
into the formula, we get
.
The answer is C.
No, this is not valid. In the picture below, 
is a vertical angle with 
. But is not 
