PLEASE HELP Need help with MATH!!!!?
Kerry is making a shadow box to display his models.It will be
8in.high,7 in.wide,and 5 in.deep.So he can see into the box,
it will not have a front.How much material will he need?
an is making a pencil holder out of plastic canvas.The pencil
holder will be 4 inches high.It will not have a top.The
circumference of the base is 9.42 inches.How much plastic
canvas does Jan need?
ANSWERS please!
I think the firsty one is 17.42 is this right?
Kerry is making a shadow box to display his models.It will be
8in.high,7 in.wide,and 5 in.deep.So he can see into the box,
it will not have a front.How much material will he need?
an is making a pencil holder out of plastic canvas.The pencil
holder will be 4 inches high.It will not have a top.The
circumference of the base is 9.42 inches.How much plastic
canvas does Jan need?
ANSWERS please!
I think the firsty one is 17.42 is this right?
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Find surface area of the 5 sides:
8x5 (x2 sides) + 7x5 (x2 sides) + 8x7 = 206
Find surface area of the sides + bottom:
Bottom:
Area of circle = (pi)r^2
So find r first
Circumference = 9.42 = 2(pi)r -> r=1.5
A = (pi)*1.5^2 = 7.065
4x9.42 (bottom) + 7.065 = 44.745
8x5 (x2 sides) + 7x5 (x2 sides) + 8x7 = 206
Find surface area of the sides + bottom:
Bottom:
Area of circle = (pi)r^2
So find r first
Circumference = 9.42 = 2(pi)r -> r=1.5
A = (pi)*1.5^2 = 7.065
4x9.42 (bottom) + 7.065 = 44.745