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liraira [26]
3 years ago
13

The base of this regular right pyramid is a square. What is its surface area?

Mathematics
1 answer:
zubka84 [21]3 years ago
5 0

Answer:

○ A) 21 ft.²

Step-by-step explanation:

{a}^{2} + 2a  \sqrt{ \frac{ {a}^{2}}{4} + {h}^{2} } = S. A. \\  \\ {3}^{2} + 2(3) \sqrt{ \frac{ {3}^{2} }{4} +  {2}^{2}} = 24 \\  \\ 24 ≈ 21

I am joyous to assist you anytime.

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Jasper needs 180 of string for his project how many yards did he buy.
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Answer:

5 yards

Step-by-step explanation:

The measurements of the 180 should be Inches

Length of string Jasper needs = 180 inches

how many yards did he buy?

1 yard = 36 inches

Number of yards he needs = Length of string Jasper needs / inches per yard

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3 0
3 years ago
Im not sure how to find the surface area. 35 points
Serga [27]

Answer: 3060 ft^2

Step-by-step explanation:

We will calculate the surface area of the rectangular prism and the triangular prism separately and then subtract off the face that isn't on the surface.

For the rectangular prism:

SA= Ph + 2B

P = 36+36+10+10

P = 92

B = 36*10 = 360

SA = 92*20+2*360

SA = 1840+720

SA = 2560

We subtract off the face on the right of the rectangular prism because it isn't on the surface so we get 2560-200 = 2360

Now for the triangular prism:

SA= Ph + 2B

P = 15+20+25

P = 60

B = 15*20/2

B = 150

SA = 60*10+2*150

SA = 600+300

SA = 900

Again we subtract off the face on the left bescause it's not on the surface so we get 900-200 = 700

Therefore, the total surface area = 2360+700 = 3060 ft^2

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Step-by-step explanation:

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Step-by-step explanation:

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