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Can you spot any pairs of angles with equal measures?
129.5^(∘), see solution.
Let's review what we know about different types of angle pairs. We will use the graph below as an example.
Now let's take a look at the different types of angle pairs and their definitions.
Pairs of Angles | ||
---|---|---|
Type | Definition | Example |
Supplementary Angles | Together, they form a straight line and their measures add up to 180^(∘). | ∠ 1 and ∠ 3 |
Corresponding Angles | They lie in corresponding positions on the same side of the transversal. | ∠ 1 and ∠ 5 |
Vertical Angles | They lie on the opposite sides of the point of intersection of two lines. | ∠ 1 and ∠ 4 |
Alternate Interior Angles | They lie between the two lines on opposite sides of the transversal. | ∠ 4 and ∠ 5 |
Alternate Exterior Angles | They lie outside the two lines on opposite sides of the transversal. | ∠ 2 and ∠ 7 |
We are asked to complete the following statement.
If the measure of ∠ 7 = 50.5^(∘), then the measure of ∠ 6 = . |
First, let's take a look at the given graph. We know that the measure of ∠ 7 is 50.5^(∘).
Note that ∠ 7 and ∠ 3 form a straight line. Therefore they are supplementary angles and their measures add up to 180^(∘) . 50.5^(∘)+∠ 3 =180^(∘) ⇕ ∠ 3 = 129.5^(∘) The measure of ∠ 3 is 129.5^(∘). Next, let's notice that lines a and b are parallel and cut by the transversal c. We will use this fact to find the measure of ∠ 6.
We can see that ∠ 3 and ∠ 6 are corresponding angles. Corresponding angles are congruent, which means that the measure of ∠ 6 is also 129.5^(∘). Let's complete our statement.
If the measure of ∠ 7 = 50.5^(∘), then the measure of ∠ 6 = 129.5^(∘). |