GEO-07 · Geometry and Trigonometry

Pythagorean theorem and right triangles

Lines, angles, and triangles · Stage 2

01 · Key idea

Use the Pythagorean theorem only for a right triangle.

Useful rulea²+b²=c²

Build on: GEO-04

02 · Worked example

A right triangle has legs 6 and 8. Find its hypotenuse.

This teaching example is original and is not an official SAT question.

Reasoning

c²=6²+8²=100, so c=10.

Answer

03 · Next step

Practice questions remain in English, as on the SAT.

GEO-07 · Pythagorean theorem and right triangles