#geometry topic 11

13 messages · Page 1 of 1 (latest)

cursive arch
#

Formula

#

647.63 = pi * 7.5 ( 7.5 + sqrt h^2 + 7.5^2)

#

Divide by pi and 7.5

#

7.5 + sqrt h^2 + 7.5^2 = about 27.5

#

Sqrt h^2 + 56.25 = 20

#

h^2 = 20^2 - 56.25

#

= 343.75

#

Take sqrt

#

Is about 18.54

#

18.54 ^2 + 7.5^2 = slant height^2

#

Just solve

valid knoll
#

are you asked to find the surface area?