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## High school geometry

### Course: High school geometry>Unit 5

Lesson 1: Pythagorean theorem

# Multi-step word problem with Pythagorean theorem

Use the Pythagorean theorem and proportional reasoning in context. Created by Sal Khan.

## Want to join the conversation?

• Could multiplying the six and 2.5 by ten first also work?
• No, because the 6 in the triangle is not part of the length of the string instead it is the distance Lainey runs. However, multiplying the 2.5 and sqrt(42.25) by 10 would still work. They both equal to 90m.
• Why was the 6meter not used to calculate how many lights were used since it was presented in the problem part of the string? It says that the string went in a straight line to the point on the ground that measured 6m.
• The 6 feet is along the ground and not part of where the string was run. As you noted, it went from the top of the door to a point on the ground (not along the ground).
• There are 91 lights because there are not only ten lights per meter of string, but there's one at the beginning of the string.