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Example Questions
Example Question #183 : Coordinate Geometry
The measure of the supplement of angle A is 40 degrees larger than twice the measure of the complement of angle A. What is the sum, in degrees, of the measures of the supplement and complement of angle A?
190
90
50
140
40
190
Let A represent the measure, in degrees, of angle A. By definition, the sum of the measures of A and its complement is 90 degrees. We can write the following equation to determine an expression for the measure of the complement of angle A.
A + measure of complement of A = 90
Subtract A from both sides.
measure of complement of A = 90 – A
Similarly, because the sum of the measures of angle A and its supplement is 180 degrees, we can represent the measure of the supplement of A as 180 – A.
The problem states that the measure of the supplement of A is 40 degrees larger than twice the measure of the complement of A. We can write this as 2(90-A) + 40.
Next, we must set the two expressions 180 – A and 2(90 – A) + 40 equal to one another and solve for A:
180 – A = 2(90 – A) + 40
Distribute the 2:
180 - A = 180 – 2A + 40
Add 2A to both sides:
180 + A = 180 + 40
Subtract 180 from both sides:
A = 40
Therefore the measure of angle A is 40 degrees.
The question asks us to find the sum of the measures of the supplement and complement of A. The measure of the supplement of A is 180 – A = 180 – 40 = 140 degrees. Similarly, the measure of the complement of A is 90 – 40 = 50 degrees.
The sum of these two is 140 + 50 = 190 degrees.
Example Question #242 : New Sat Math Calculator
is a straight line. intersects at point . If measures 120 degrees, what must be the measure of ?
degrees
None of the other answers
degrees
degrees
degrees
degrees
& must add up to 180 degrees. So, if is 120, (the supplementary angle) must equal 60, for a total of 180.
Example Question #11 : Plane Geometry
Two parallel lines are intersected by a transversal. If the minor angle of intersection between the first parallel line and the transversal is , what is the minor angle of intersection between the second parallel line and the transversal?
When a line intersects two parallel lines as a transversal, it always passes through both at identical angles (regardless of distance or length of arc).
Example Question #11 : Geometry
If , , and , what is the measure, in degrees, of ?
58
122
148
32
62
148
The question states that . The alternate interior angle theorem states that if two parallel lines are cut by a transversal, then pairs of alternate interior angles are congruent; therefore, we know the following measure:
The sum of angles of a triangle is equal to 180 degrees. The question states that ; therefore we know the following measure:
Use this information to solve for the missing angle:
The degree measure of a straight line is 180 degrees; therefore, we can write the following equation:
The measure of is 148 degrees.
Example Question #2 : How To Find An Angle Of A Line
Lines A and B in the diagram below are parallel. The triangle at the bottom of the figure is an isosceles triangle.
What is the degree measure of angle ?
Since A and B are parallel, and the triangle is isosceles, we can use the supplementary rule for the two angles, and which will sum up to . Setting up an algebraic equation for this, we get . Solving for , we get . With this, we can get either (for the smaller angle) or (for the larger angle - must then use supplementary rule again for inner smaller angle). Either way, we find that the inner angles at the top are 80 degrees each. Since the sum of the angles within a triangle must equal 180, we can set up the equation as
degrees.
Example Question #1 : How To Simplify Square Roots
Which of the following is equal to ?
√75 can be broken down to √25 * √3. Which simplifies to 5√3.
Example Question #23 : Arithmetic
Simplify .
Rewrite what is under the radical in terms of perfect squares:
Therefore, .
Example Question #2 : Simplifying Square Roots
What is ?
We know that 25 is a factor of 50. The square root of 25 is 5. That leaves which can not be simplified further.
Example Question #25 : Arithmetic
Which of the following is equivalent to ?
Multiply by the conjugate and the use the formula for the difference of two squares:
Example Question #3 : Simplifying Square Roots
Which of the following is the most simplified form of:
First find all of the prime factors of
So