GeometryMenu1Left and Right, Up and Down, Backwards and Forwards2What Is Mirror Symmetry in Maths?3What Is Perimeter and Circumference?4What Does Area in Geometry Mean?5What Are Loci in Geometry?6How to Draw in a Coordinate System7What Are Tangent Lines?8What Is a Quadrilateral?9How Do You Find the Perimeter and Area of a Square?10How Do You Find the Perimeter and Area of a Rectangle?11How to Find the Perimeter and Area of a Parallelogram12How Do You Find the Perimeter and Area of a Rhombus?13How Do You Find the Perimeter and Area of a Trapezoid?14What Is a Triangle?15What Is the Sum of Angles of a Triangle?16What Is the Formula for the Perimeter of a Triangle?17What Is the Formula for the Area of a Triangle?Activity Set 1Activity Set 218What Are 30°–60°–90° Triangles?19What Does the Pythagorean Theorem State?20What Can the Pythagorean Theorem be Used For?21What Is the Pythagorean Theorem Formula?22What Are the Four Centers of a Triangle?23How to Find the Circumcenter of a Triangle24How to Find the Incenter of a Triangle25How to Find the Centroid and Medians of a Triangle26How to Find the Orthocenter and Altitudes of a Triangle27What Is the Euler Line?28What Is the Circumference and Area of a Circle?29What Is the Circle Constant Pi?30What Is the Area of a Circular Sector?31How Are Tangent, Secant and Chord of a Circle Related?32What Are the Lines of Symmetry in a Circle?33What Is the Equation of a Circle?Activity Set 134Thales' TheoremActivity Set 135Circle of ApolloniusActivity Set 136What Is the Power of a Point Theorem?37What Are Ellipses?38What Is the Equation of an Ellipse?39What Does Regular Polygon Mean?40What Are the Angles of a Regular Polygon?41Area and Perimeter of a Pentagon42What Are Composite Figures?43Area of Composite Figures in Two Dimension44Examples of Geometric Patterns45What Does Tiling and Tessellation Mean in Math?46How Do You Find the Ratio of Similarity?47What Is the Definition of Similar Figures?48How Do You Know if Triangles Are Congruent?49What Is the Golden Ratio?Activity Set 150What Is a Point and a Line Segment?Activity Set 151Geometry Translations Explained52How to Construct Two Parallel LinesActivity Set 153Steps to Construct a Parallel Line Through a Point54How to Reflect About a Line55How to Reflect a Figure over a Line with a Compass56Constructing the Tangent to a CircleActivity Set 157What Are Acute, Right and Obtuse Angles?58Pairs of Angles (Opposite, Adjacent and Supplementary)Activity Set 159Application of Opposite AnglesActivity Set 1Use the property that opposite angles formed by two intersecting lines are equal to find the missing angle.Given that one angle formed by two intersecting lines is 70°, find the measure of the opposite angle.Opposite angle =CheckResetContinue60How to Prove the Inscribed Angle Theorem61Constructing a 60°, 30° or 15° AngleActivity Set 162What Does Normal Mean in Geometry?63Constructing a 90°, 45° or 22.5° AngleActivity Set 164What Does Bisecting an Angle Mean?65How Do You Rotate a Figure?66Construction of Larger FiguresActivity Set 167Examples of Larger Constructions68What Does Polyhedron Mean?69Volume and Surface Area of Three-dimensional Figures70What Does a Cylinder Shape Look Like?71How to Find Surface Area and Volume of a Cylinder72What Does a Prism Shape Look Like?73How to Find Surface Area and Volume of a PrismActivity Set 1Activity Set 274How Are Cones and Pyramids Alike?75How to Find Volume and Surface Area of a Pyramid76How to Find Volume and Surface Area of a Cone77What Is the Difference Between a Sphere and an Ellipsoid?78How to Find Volume and Surface Area of a Sphere79Examples of Composite Solid Figures80How to find Surface Area and Volume of Composite Figures81Unit CircleActivity Set 182RadiansActivity Set 183What Is the Definition of Supplementary Angles?84Sine, Cosine and Tangent and Their Inverse Functions85General Formula for Area of a Triangle86Law of SinesActivity Set 187Law of CosinesActivity Set 188What Are the Trigonometric Identities?89How to Solve Basic Trigonometric Equations90How to Solve Trigonometric Equations Using Identities91What Are the Trigonometric Functions?92Harmonic OscillatorActivity Set 193Transforming into a Harmonic Oscillator94How to Do Perspective Drawing with One Vanishing Point95Drawing Eye Level Perspective with One Vanishing Point96Drawing Bird's Eye View with One Vanishing Point97Drawing Worm's Eye View with One Vanishing Point98How to Do Perspective Drawing with Two Vanishing Points99Drawing Eye Level Perspective with Two Vanishing Points100Drawing Bird's Eye View with Two Vanishing Points101Drawing Worm's Eye View with Two Vanishing Points
Use the property that opposite angles formed by two intersecting lines are equal to find the missing angle.Given that one angle formed by two intersecting lines is 70°, find the measure of the opposite angle.Opposite angle =CheckResetContinue
