Recap: Scale in the World
Part of the Triangles section of Coddy's Geometry journey. Lesson 61 of 71.
Challenge
A 10 m mast casts a 12 m shadow. At the same moment a tower casts an 18 m shadow.
Find the height x of the tower.
Try it yourself
x/10 = 18/12
Solve for x
All lessons in Triangles
1Sides and Names
Three Sides, Three CornersSorting by SidesNaming by AnglesTicks into EquationsThe Longest SideRecap: Sorting Triangles4Area
Half the RectangleHeight Is Not a SideRight Triangle AreaFinding the HeightFinding the BaseAny Side Can Be the BaseRecap: Area10Scale in the World
ShadowsAcross the RiverA Side with an ExpressionNested TrianglesRecap: Scale in the World2The Triangle Inequality
Can Three Sticks Meet?Exactly ReachingHow Short Can It Be?How Long Can It Be?The Range of the Third SideThe FormulaWhole-Number SidesRecap: The Third Side5The Hypotenuse
Squares on the SidesFinding the HypotenusePythagorean TriplesWhen It Is Not WholeSimplifying the RootRecap: The Hypotenuse8Special Right Triangles
The 45-45-90 TriangleLegs from the HypotenuseThe 30-60-90 TriangleAll Three SidesWhich Triangle Is It?Recap: Special Triangles11Mixing Area and Pythagoras
Height of an IsoscelesArea from the HeightThe Equilateral TriangleRight Triangle PerimeterRecap: Two Tools3Perimeter
Around the EdgeA Missing SideIsosceles PerimeterEquilateral PerimeterSides as ExpressionsWrite the PerimeterRecap: Around the Edge6Finding a Leg
Working BackwardsThe LadderWhich Side Is c?A Leg That Is Not WholeRecap: Finding a Leg