Question 1
On a number line, the midpoint of the segment joining points and is . What is the value of ?
- A4
- B6
- C9
- D10
Show answer
Answer: C — 9
The midpoint equation is . Therefore, and .
Study on the fly›SHSAT›Mathematics › Coordinate plane and distance
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Coordinate plane and distance on the SHSAT Mathematics section covers midpoints on a number line and distances between points in the plane, including both a grid path of a horizontal segment then a vertical one and the straight-line segment joining the same points. A student has to recover a missing endpoint from a given midpoint, compare those two path lengths, and find the distance between two coordinates. Items are multiple choice with short setups; traps mix grid-path length with straight-line distance, drop a sign, or mishandle the midpoint. Choices are usually single numbers or simple algebraic values matching those errors.
Question 1
On a number line, the midpoint of the segment joining points and is . What is the value of ?
Answer: C — 9
The midpoint equation is . Therefore, and .
Question 2
A path from to is a horizontal segment followed by a vertical segment. A second path is the straight-line segment joining the same points. How much longer, in units, is the first path than the second path?
Answer: A — 2 units
The first path is units. The straight-line path is units. So the first path is units longer.
Question 3
Points and lie on a coordinate plane. What is the distance between the points?
Answer: B — 5 units
Use the coordinate differences as the legs of a right triangle: .
Practice 84 Coordinate plane and distance questions in the app
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