Everything Maths Grade 10

Surface area of pyramids, cones and spheres EMA7R

Square pyramid b

hs

Surface area =area of base+

area of triangular sides

=b^2 + 4

( 1

2 bhs

)

=b(b+ 2hs)

Triangular pyramid

hs

hb

b

Surface area =area of base+

area of triangular sides

=

( 1

2 bhb

)

+ 3

( 1

2 bhs

)

=^12 b(hb+ 3hs)

Right cone

r

h

Surface area =area of base+

area of walls

=r^2 +^12  2 rh

=r(r+h)

Sphere

r

Surface area= 4r^2

Chapter 13. Measurements 433