Part 1 of the proof of Heron's Formula
Showing that the expression in part 1 is identical to Heron's Formula
Parts of a Circle
This video is from the Khan Academy subject of Math on the topic of Geometry and it covers Perimeter and Area Basics.
Perimeter and Area of a Non-Standard Polygon
This video is from the Khan Academy subject of Math on the topic of Geometry and it covers Perimeter of a shape.
Simple proof using RSH postulate to show that a radius perpendicular to a chord bisects it
Join the ladybug in an exploration of rotational motion. Rotate the merry-go-round to change its angle, or choose a constant angular velocity or angular acceleration. Explore how circular motion relates to the bug's x,y position, velocity, and acceleration using vectors or graphs.
Thinking about the distance between a point and a line. Proof that a point on an angle bisector is equidistant to the sides of the angle and a point equidistant to the sides is on an angle bisector
Challenging problem to find an angle
Proving that vertical angles are equal
Showing that the centroid divides each median into segments with a 2:1 ratio (or that the centroid is 2/3 along the median)
Pythagorean Theorem
Pythagorean Theorem 1
Pythagorean Theorem 2
Pythagorean Theorem 3
More Pythagorean Theorem examples. Introduction to 45-45-90 triangles.
Proof of the Pythagorean Theorem using similarity
Basics of quadrilaterals including concave, convex ones. Parallelograms, rectangles, rhombi and squares
Quadrilateral Properties