geometry

Presentation

•

Mathematics

•

9th Grade

•

Hard

•

CCSS

HSG.CO.C.10, 4.G.A.1

Standards-aligned

Anett Solti

Used 10+ times

FREE Resource

9 Slides • 5 Questions

Triangles, Polygons and Quadrilaterals

Triangles

isosceles, equilateral
acute-triangle, right-angled triangle, obtuse triangle
the sum of the interior angles is 180°
theorem of Pythagoras
altitude, area
$T=\frac{a\times m_a}{2}$

Multiple Choice

In a triangle there are equal angles opposite equal sides.

true

false

not always true

Multiple Choice

In any triangle is a shorter interior angle opposite the longer side of two sides than opposite the shorter one

true

false

depends on

Multiple Choice

The set of points of the plane which are equidistant from points A and B is called the.......of the line segment A and B.

straigth line

angle

perpedicular bisector

I have no idea

Circle

The set of points of the plane which are at a given point O of the plane is a circle
center, radius, diameter, chord, secant line, tangent line

Multiple Choice

The area of (a polygon)

kerület

terület

felszín

térfogat

Multiple Choice

The perimeter (of a polygon )

kerület

terület

felszín

térfogat

The inscribed circle of a triangle

- the intersect point of the three interior angle bisectors

- equidistant from all sides

- A=r×s

s=half of the perimeter

Calculate the area of the triangle if P=17 m and r=2.5 cm

The circumscribed circle of a triangle

the intersect points of the three perpendicular bisectors of the sides
equidistant from all vertices

Polygons

convex, concave
numbers of diagonals
$\frac{n\left(n-3\right)}{2}$
the sum of interior angles $\left(n-2\right)\times180°$
one interior angle of a regular polygon $\frac{\left(n-2\right)\times180°}{n}$
the sum of the exterior angles 360°

Quadrilaterals

the sum of interior angles 360°
trapezium
paralellogram
rhombus
kites
rectangle
square

Triangles, Polygons and Quadrilaterals

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