8th Grade Math - Slope in Similar Right Triangles

This post explains and gives practice opportunities related to TEKS 8.4A:

use similar right triangles to develop an understanding that slope, m, given as the rate comparing the change in y- values to the change in x- values, (y2 - y1 ) / (x2 - x1 ), is the same for any two points (x1 , y1 ) and (x2 , y2 ) on the same line

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Instruction

Students learn how slope remains the same for two similar right triangles that share a hypotenuse with a continuous line.

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STAAR Practice

Between 2016 and 2025, this supporting standard has been tested 6 times on the STAAR test. Videos explaining the problems can be found below. If you'd rather take a quiz over these questions, click here. The videos below are linked to the questions in the quiz as answer explanations after the quiz is submitted.

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To view all the posts in this 8th grade TEKS review series, click here.