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Home/Tag: Geometry
26 06, 2016

## Similar Triangles

Similar Triangles Equiangular Two angles of a triangle are equal to two angles of another triangle. Three Sides Three sides of a triangle are proportional to three sides of another triangle 2 Sides & Included Angle Two sides of a triangle are proportional to [...]

17 06, 2016

## Circle Geometry

Circle Geometry Go to the Circle Geometry Forum to see more questions or ask your own Topics Covered in Circle Geometry Parts Of A Cirlce Arcs, Angles & Chords Chord Properties Concyclic Points Tangent Properties Formulas Used in Circle Geometry [...]

12 06, 2016

## Similar Triangle Ratios

Similar Triangle Ratios the scale factor is what you need to times the side in the first triangle to get the number in the second triangle scale factors can be expressed in two ways Going from first triangle to second: $frac{b}{a}$ or going from second triangle to [...]

11 06, 2016

## Congruent Triangles

Congruent Triangles SSS Side Side Side All three sides of one triangle are equal to three sides of the other triangle SAS Side Angle Side Sides about equal angle in one triangle equal to sides about same angle in second triangle AAS Angle Angle  Side Two angles [...]

8 06, 2016

## Interior Angle of Polygon

Interior Angle of Polygon $interior\;\angle =\frac{180(n-2)}{n}$ worked examples Find size if the angle in a regular octagon. $\angle =\frac{180(8-2)}{8}$ $\angle =\frac{1080}{8}$ = 135° octagon has 6 sides substitute n = 8 into formula $\angle =\frac{180(n-2)}{n}$ further examples harder examples How many sides does [...]

8 06, 2016

## Similar Triangle Ratios

Similar Triangle Ratios the scale factor is what you need to times the side in the first triangle to get the number in the second triangle scale factors can be expressed in two ways Going from first triangle to second: $\frac{b}{a}$ or going from second triangle to first: $\frac{a}{b}$ [...]

25 08, 2015

## Triangle Inequality

Triangle Inequality a + b > c The sum of the two smaller sides of a triangle must be more than the third side, or you cannot draw the triangle. a + b > c If the sum is smaller than the longest side, then they will be too short [...]

24 08, 2015

## Shapes

By |2016-10-21T13:17:10+10:00August 24th, 2015|Tags: , , |0 Comments

Shapes Square 4 sides all sides equal opposite sides parallel 4 vertices 4 axes of symmetry angle sum 360° diagonals bisect at 90° diagonals equal Rectangle 4 sides (quadrilateral) opposite sides equal opposite sides parallel 4 vertices 2 axes of symmetry angle sum 360° diagonals bisect each [...]

24 08, 2015

## Parallel Lines

Diagonals of Polygon $d=\frac{n(n-3)}{2}$ worked examples Find the number of diagonals in a hexagon. $d=\frac{6(6-3)}{2}$ = 9 hexagon has 6 sides substitute n = 6 Find the number of diagonals in a decagon. $d=\frac{10(10-3)}{2}$ = 35 decagon has 10 sides substitute n = 6 further examples [...]