what properties of medians and centroids ?

medians - the line segment connecting a vertex of a triangle to  the midpoint of the opposite side.

centroids - the intersection of the 3 medians in a triangle (every triangle)

what are angle bisectors , altitudes , perpendiclar bisectors ?

Altitude - the height of a triangle . meets the "ground" at a right angle . (go through vertex)

Bisectors - a line segment  through a vertex perpendicular to a line containing the opposite side .

Angle Bisectors - bisects an angle in half , creating two congruent angels

formulas for volume :]

cylinder = v=Bh
pyramid = v= 1/3Bh
right circular cone =v=1/3Bh
sphere = v = 4/3 . pie . R . cubed

formulas :] for area

rectangles : A=bh

Triangles : A = bh/2

Circles : A= pie  . R . squared 


cylinder = SA = LA + 2B
                 LA= 2pie . R . height 


parallelogram = A=bh 


trapezoid = 




polygons = A = nas/2

kite = d1d2/2

prism = SA = LA+2B
             LA= PH

Pyramid = SA =LA+B
                 LA=pl/2


                         
                        

how do we find the surface area of cones ?

the base of a cone is a circle and the other end (vertex) is pointed similar to a pyramid .
slant height of a cone is the distance from the vertex of a point on the edge of a base
 formulas _

lateral area =  RL

surface area = LxA+ base 

how do we find the surface area and lateral area of pyramids and cones ?

 pyramids - a solid that connects a polygon base to a point

slant height - pyramid is the height of one of the lateral faces .

Formula surface area -
SA=1/2 PL + base area

formula lateral area -
LA= 1/2 PL

how do we calculate the area of rectangles and triangles ?

to find the area of a rectangle is simple just do base x height .

to find the area of a triangle we would need to do the formula -
A=1/2 bh