# Geometry Facts quiz

- StudyBlue
- Rhode-island
- Moses Brown School
- Geometry
- Maxwell
- Geometry Facts quiz

**Created:**2011-01-22

**Last Modified:**2011-06-27

180 degrees

The size of the triangle does not matter!

What two facts do you know about the interior angles of an isosceles triangle

the sum total of the angles = 180 degrees

the angles opposite the equal sides are also equal

They will be the same

= square of the ratio of their sides

divide side triangle 1 by side triangle 2

square the result

multiply that result by the area of triangle 1

1/2 base X height

Height might be outside the triangle!

3 4 5

5 12 13

s s s√2 (Great for squares, when asked the diagonal of a square)!!

s/√2, s/√2, s also great for squares

s 2s s√3 for 30 60 90 triangles - favorite test question. Hyp is 2s

1/2 d²

why? area = base²

but base² + base² = diagonal ² ; 2base² =diagonal ²;

therefore area = base²= 1/2diagonal ²

what is the circumference of a circle

what is the surface area of a rectangular solid

what is the surface area of a cylinder

The side = circumference * height (2¶r * h) plus

the top and bottom = 2(¶r²)

Don't forget the top and bottom!

(x-h)² + (y-k)² = r² where h and k are the center points and r is the radius

(Number of sides - 2) * 180

Triange - 180

square = (4-2) * 180 = 360

pentagor - (5-2) * 180 = 540

what is the volume of a cylinder

height X circumference (or height X ¶r²)

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