Find the surface area of a square pyramid with a base length of 11 cm and a slant height of 15 cm.
472 cm2
451 cm2***
781 cm2
330 cm2
Find the volume of a rectangular prism with the following dimensions:
Length = 5 mm
Base = 7 mm
Height = 3 mm
142 mm3 ***
105 mm3
126 mm3
130 mm3
2 answers
Please
Surface area of a square pyramid usually just adds up the surface area of the 4 isosceles triangles, not including the base
one of them:
base = 11
hypotenuse = 15
height^2 + 5.5^2 = 15^2
height^2 = 194.75
height = √194.75
area of one of them = (1/2)(11)√194.75 = appr 76.754..
so 4 of them = 307.0162
which is none of your choices, so let's add on the base of 11^2 or 121 to get appr 428 cm^2
(none of your answers fit)
2nd question:
what is 5x7x3 ?????
one of them:
base = 11
hypotenuse = 15
height^2 + 5.5^2 = 15^2
height^2 = 194.75
height = √194.75
area of one of them = (1/2)(11)√194.75 = appr 76.754..
so 4 of them = 307.0162
which is none of your choices, so let's add on the base of 11^2 or 121 to get appr 428 cm^2
(none of your answers fit)
2nd question:
what is 5x7x3 ?????
1 answer