Chapter Test
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Recall the classification of quadrilaterals. We can begin by finding the slopes of the sides.
kite
Let's plot the given points on a coordinate plane and graph the quadrilateral.
Quadrilateral | Definition |
---|---|
Parallelogram | Both pairs of opposite sides are parallel |
Rhombus | Parallelogram with four congruent sides |
Rectangle | Parallelogram with four right angles |
Square | Parallelogram with four congruent sides and four right angles |
Trapezoid | Quadrilateral with exactly one pair of parallel sides |
Isosceles Trapezoid | Trapezoid with legs that are congruent |
Kite | Quadrilateral with two pairs of consecutive sides congruent and no opposite sides congruent |
Now, let's find the slopes of the sides using the Slope Formula.
Side | Slope Formula | Simplified |
---|---|---|
Slope of AB: ( 3,-2), ( 5,4) | 4-( -2)/5- 3 | 3 |
Slope of BC: ( 5,4), ( 3,6) | 6- 4/3- 5 | - 1 |
Slope of CD: ( 3,6), ( 1,4) | 4- 6/1- 3 | 1 |
Slope of DA: ( 1,4), ( 3,-2) | -2- 4/3- 1 | - 3 |
We can tell that since the slopes of opposite sides are not equal, the pairs of opposite sides cannot be parallel. Therefore, we suspect that the quadrilateral is a kite. To check, we can find the lengths of its sides using the Distance Formula.
Side | Distance Formula | Simplified |
---|---|---|
Length of AB: ( 3,-2), ( 5,4) | sqrt(( 5- 3)^2+( 4-( -2))^2) | sqrt(40) |
Length of BC: ( 5,4), ( 3,6) | sqrt(( 3- 5)^2+( 6- 4)^2) | sqrt(8) |
Length of CD: ( 3,6), ( 1,4) | sqrt(( 1- 3)^2+( 4- 6)^2) | sqrt(8) |
Length of DA: ( 1, 4), ( 3,-2) | sqrt(( 3- 1)^2+( -2- 4)^2) | sqrt(40) |
Since two pairs of consecutive sides are of the same length, they are congruent. What is more, no opposite sides of the quadrilateral are of the same length. Therefore, the most precise name for this quadrilateral is a kite.