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CONES AND PYRIMIDS Jim Smith JCHS

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**PARTS OF A PYRIMID HEIGHT ( h ) SLANT HEIGHT ( l ) ( SQUARE BASE )**

BASE EDGE

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

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**LA = ½ p l SA = LA + B VOL= ⅓ B h**

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

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**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

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**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

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