1. CONES
AND
PYRIMIDS
Jim Smith JCHS

2. PARTS OF A PYRIMID HEIGHT ( h ) SLANT HEIGHT ( l ) ( SQUARE BASE )
BASE EDGE

3. PARTS OF CONES
HEIGHT ( h )
SLANT HEIGHT ( l ) r

4. LA = ½ p l SA = LA + B VOL= ⅓ B h
FORMULAS
LA = ½ p l
SA = LA + B
VOL= ⅓ B h

5. FIND THE PERIMETER AND AREA FIRST
Base edge h sl
P = = 48
B = 12 x 12 = 144 12
LA = ½ p l = ½ x 48 x 10 = 240 sq un
SA = LA + B = = 384 sq un
VOL = ⅓ B x h = ⅓ 144 x 8 = 384 cu un

6. r h sl 3 4 5 p = 2 π r = 2 π 3 = 6 π B = π r² = π 3² = 9 π
p = 2 π r = 2 π 3 = 6 π
B = π r² = π 3² = 9 π 3
LA = ½ p l = ½ x 6 π x 5 = 15 π sq un
SA = LA + B = 15 π + 9 π = 24 π sq un
VOL = ⅓ B h = ⅓ x 9 π x 4 = 12 π cu un