CK12 - Geometry

10. Write the equation in standardform.

Answers

1. A [Diff: 1]


2. [Diff: 2]


3. [Diff: 1]


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8. [Diff: 3]


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10. [Diff: 3]

PerpendicularLines

LearningObjectives

• Identifycongruentlinearpairsof angles


• Identifythe anglesformedby perpendicularintersectinglines


• Identifycomplementaryadjacentangles

Introduction

Wherethey intersect,perpendicularlinesform right angles.This lessonexploresthe differentprop-
ertiesof perpendicularlines and how to understandthemin variousgeometricalcontexts.

Congruentlinearpairs

A LinearPair of Anglesis a pair of adjacentangleswhoseoutersidesform a straightline. The LinearPair
Postulatestatesthat the anglesof a linearpair are supplementary, that is, their measuresmustsum to

This makessensebecause is the measureof a straightangle.Whentwo anglesthat form a

linearpair are congruent,thereis only one possiblemeasurefor eachof them— Rememberingthat

they mustsum to you can imaginehow to find two equalangles.The easiestway to do this is to divide

by 2, the numberof congruentangles.