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Three angles of a quadrilateral measure ...

Three angles of a quadrilateral measure `110^(@), 82^(@) and 68^(@)`. Find the measure of the fourth angle.

A

`80^(@).`

B

`100^(@).`

C

`200^(@).`

D

`70^(@).`

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The correct Answer is:
To find the measure of the fourth angle in a quadrilateral when three angles are given, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the property of quadrilaterals**: The sum of all four angles in a quadrilateral is always 360 degrees. 2. **Identify the given angles**: The three angles provided are: - Angle A = 110 degrees - Angle B = 82 degrees - Angle C = 68 degrees 3. **Set up the equation**: Let the fourth angle be represented as \( x \). According to the property of quadrilaterals, we can write the equation: \[ \text{Angle A} + \text{Angle B} + \text{Angle C} + \text{Angle D} = 360 \] This translates to: \[ 110 + 82 + 68 + x = 360 \] 4. **Calculate the sum of the known angles**: \[ 110 + 82 = 192 \] \[ 192 + 68 = 260 \] 5. **Substitute the sum into the equation**: Now, we can substitute the sum of the angles into the equation: \[ 260 + x = 360 \] 6. **Solve for \( x \)**: To find \( x \), subtract 260 from both sides: \[ x = 360 - 260 \] \[ x = 100 \] 7. **Conclusion**: The measure of the fourth angle is \( 100 \) degrees. ### Final Answer: The measure of the fourth angle is \( 100^\circ \).

To find the measure of the fourth angle in a quadrilateral when three angles are given, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the property of quadrilaterals**: The sum of all four angles in a quadrilateral is always 360 degrees. 2. **Identify the given angles**: The three angles provided are: - Angle A = 110 degrees ...
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