Grade 8 · Geometry & measurement

Distance formula practice

Distance formula is a grade 8 math skill aligned to Common Core standard 8.G.B.8: apply the Pythagorean Theorem to find the distance between two points in a coordinate system. Below are 8 practice questions with answers and step-by-step explanations, drawn from the 15 distance formula problems our math games drill.

CCSS 8.G.B.815 questions in the bank
Sample questions

Try 8 for free

Question 1easy

What is the length of the vertical segment from (5,3)(5, -3) to (5,9)(5, 9)?

Both points have x=5x = 5, so the length is 9(3)=12|9 - (-3)| = 12.

Question 2easy

What is the distance from (0,0)(0, 0) to (3,4)(3, 4)?

32+42=9+16=25=5\sqrt{3^2 + 4^2} = \sqrt{9 + 16} = \sqrt{25} = 5.

Question 3easy

The distance between (0,0)(0, 0) and (6,8)(6, 8) is dd. What is d2d^{2}?

d2=62+82=36+64=100d^{2} = 6^2 + 8^2 = 36 + 64 = 100.

Question 4easy

How long is the segment joining (1,5)(-1, -5) and (1,2)(-1, 2)?

Both points have x=1x = -1, so the length is 2(5)=7|2 - (-5)| = 7.

Question 5easy

What is the distance from (1,2)(1, 2) to (4,6)(4, 6)?

Δx=3\Delta x = 3, Δy=4\Delta y = 4. 32+42=9+16=25=5\sqrt{3^2 + 4^2} = \sqrt{9 + 16} = \sqrt{25} = 5.

Question 6easy

What is the distance from (0,0)(0, 0) to (5,12)(5, 12)?

52+122=25+144=169=13\sqrt{5^2 + 12^2} = \sqrt{25 + 144} = \sqrt{169} = 13.

Question 7easy

What is the distance from (2,3)(2, 3) to (9,3)(9, 3)?

Both points have y=3y = 3, so the distance is 92=7|9 - 2| = 7.

Question 8easy

Two legs of a right triangle measure 66 and 88. What is the hypotenuse?

62+82=36+64=100=10\sqrt{6^2 + 8^2} = \sqrt{36 + 64} = \sqrt{100} = 10.

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